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TrojanSpy.VBS.EMOTET.0NA103CH23

May 19, 2023
 Analysis by: Jayvee Mark Villaroman
 ALIASES:

Trojan:VBS/Emotet.RVA!MTB (MICROSOFT)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

63,088 bytes

File Type:

WSF

Memory Resident:

No

Initial Samples Received Date:

15 May 2023

Payload:

Connects to URLs/IPs, Drops files, Modifies system registry

Arrival Details

This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan Spy drops the following files:

  • %User Temp%\Cab{Random 4 numbers}.tmp
  • %User Temp%\Tar{Random 4 numbers}.tmp
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Trojan Spy modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\ROOT\Certificates\
3B1EFD3A66EA28B16697394703A72CA340A05BD5
Blob = \x04\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00\xa2f\xbb}\xcc8\xa5bc\x13a\xbb\xf6\x1d\xd1\x1b\x14\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00\xd5\xf6V\xcb\x8f\xe8\xa2\bh\xd1=\x94\x90[\xd7\xce\x9a\x18\xc4\x0b\x00\x00\x00\x01\x00\x00\x00T\x00\x00\x00M\x00i\x00c\x00r\x00o\x00s\x00o\x00f\x00t\x00 \x00R\x00o\x00o\x00t\x00 \x00C\x00e\x00r\x00t\x00i\x00f\x00i\x00c\x00a\x00t\x00e\x00 \x00A\x00u\x00t\x00h\x00o\x00r\x00i\x00t\x00y\x00 \x002\x000\x001\x000\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00;\x1e\xfd:f\xea(\xb1f\x979G\x03\xa7,\xa3@\xa0[\xd5\x0f\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00\x08\xfb\xa81\xc0\x85D \x8fR\x08hk\x99\x1c\xa1\xb2\xcf\xc5\x10\xe70\x17\x84\xdd\xf1\xeb[\xf0929\x19\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\ROOT\Certificates\
3B1EFD3A66EA28B16697394703A72CA340A05BD5
Blob = \x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x00\x10\x00\x00\x19\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
CABD2A79A1076A31F21D253635CB039D4329A5E8
Blob = \x0f\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00?\x04\x11\xed\xe9\xc4GpW\xd5~W\x88;\x1f [ \xcd\xc0\xf3&1)\xb1\xee\x02i\xa2g\x8fcb\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00\x96\xbc\xec\x06&Iv\xf3t`w\x9a\xcf(\xc5\xa7\xcf\xe8\xa3\xc0\xaa\xe1\x1a\x8f\xfc\xee\x05\xc0\xbd\xdf\x08\xc6\x0b\x00\x00\x00\x01\x00\x00\x00\x1a\x00\x00\x00I\x00S\x00R\x00G\x00 \x00R\x00o\x00o\x00t\x00 \x00X\x001\x00\x00\x00 \x00\x00\x00\x01\x00\x00\x00\x16\x00\x00\x000\x14\x06\x08+\x06\x01\x05\x05\x07\x03\x02\x06\x08+\x06\x01\x05\x05\x07\x03\x01\x14\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00y\xb4Y\xe6{\xb6\xe5\xe4\x01s\x80\x08\x88\xc8\x1aX\xf6\xe9\x9bn\x1d\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00s\xb6\x87a\x95\xf5\xd1\x8e\x04\x85\x10B*\xef\x04\xe3\x03\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00\xca\xbd*y\xa1\x07j1\xf2\x1d%65\xcb\x03\x9dC)\xa5\xe8 \x00\x00\x00\x01\x00\x00\x00o\x05\x00\x000\x82\x05k0\x82\x03S\xa0\x03\x02\x01\x02\x02\x11\x00\x82\x10\xcf\xb0\xd2@\xe3YDc\xe0\xbbc\x82\x8b\x000 \x06 *\x86H\x86\xf7 \x01\x01\x0b\x05\x000O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Internet Security Research Group1\x150\x13\x06\x03U\x04\x03\x13\x0cISRG Root X10\x1e\x17 150604110438Z\x17 350604110438Z0O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Internet Security Research Group1\x150\x13\x06\x03U\x04\x03\x13\x0cISRG Root X10\x82\x02"0 \x06

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
CABD2A79A1076A31F21D253635CB039D4329A5E8
Blob = \x04\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00\x0c\xd2\xf9\xe0\xda\x17s\xe9\xed\x86M\xa5\xe3p\xe7N\x03\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00\xca\xbd*y\xa1\x07j1\xf2\x1d%65\xcb\x03\x9dC)\xa5\xe8\x1d\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00s\xb6\x87a\x95\xf5\xd1\x8e\x04\x85\x10B*\xef\x04\xe3\x14\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00y\xb4Y\xe6{\xb6\xe5\xe4\x01s\x80\x08\x88\xc8\x1aX\xf6\xe9\x9bn \x00\x00\x00\x01\x00\x00\x00\x16\x00\x00\x000\x14\x06\x08+\x06\x01\x05\x05\x07\x03\x02\x06\x08+\x06\x01\x05\x05\x07\x03\x01\x0b\x00\x00\x00\x01\x00\x00\x00\x1a\x00\x00\x00I\x00S\x00R\x00G\x00 \x00R\x00o\x00o\x00t\x00 \x00X\x001\x00\x00\x00b\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00\x96\xbc\xec\x06&Iv\xf3t`w\x9a\xcf(\xc5\xa7\xcf\xe8\xa3\xc0\xaa\xe1\x1a\x8f\xfc\xee\x05\xc0\xbd\xdf\x08\xc6\x0f\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00?\x04\x11\xed\xe9\xc4GpW\xd5~W\x88;\x1f [ \xcd\xc0\xf3&1)\xb1\xee\x02i\xa2g\x8fc \x00\x00\x00\x01\x00\x00\x00o\x05\x00\x000\x82\x05k0\x82\x03S\xa0\x03\x02\x01\x02\x02\x11\x00\x82\x10\xcf\xb0\xd2@\xe3YDc\xe0\xbbc\x82\x8b\x000 \x06 *\x86H\x86\xf7 \x01\x01\x0b\x05\x000O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Internet Security Research Group1\x150\x13\x06\x03U\x04\x03\x13\x0cISRG Root X10\x1e\x17 150604110438Z\x17 350604110438Z0O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Internet Security Research Group1\x15

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
CABD2A79A1076A31F21D253635CB039D4329A5E8
Blob = \x19\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00/\xe1\xf7\x0b\xb0]|\x923[\xc5\xe0[\x98M\xa6\x0f\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00?\x04\x11\xed\xe9\xc4GpW\xd5~W\x88;\x1f [ \xcd\xc0\xf3&1)\xb1\xee\x02i\xa2g\x8fcb\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00\x96\xbc\xec\x06&Iv\xf3t`w\x9a\xcf(\xc5\xa7\xcf\xe8\xa3\xc0\xaa\xe1\x1a\x8f\xfc\xee\x05\xc0\xbd\xdf\x08\xc6\x0b\x00\x00\x00\x01\x00\x00\x00\x1a\x00\x00\x00I\x00S\x00R\x00G\x00 \x00R\x00o\x00o\x00t\x00 \x00X\x001\x00\x00\x00 \x00\x00\x00\x01\x00\x00\x00\x16\x00\x00\x000\x14\x06\x08+\x06\x01\x05\x05\x07\x03\x02\x06\x08+\x06\x01\x05\x05\x07\x03\x01\x14\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00y\xb4Y\xe6{\xb6\xe5\xe4\x01s\x80\x08\x88\xc8\x1aX\xf6\xe9\x9bn\x1d\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00s\xb6\x87a\x95\xf5\xd1\x8e\x04\x85\x10B*\xef\x04\xe3\x03\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00\xca\xbd*y\xa1\x07j1\xf2\x1d%65\xcb\x03\x9dC)\xa5\xe8\x04\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00\x0c\xd2\xf9\xe0\xda\x17s\xe9\xed\x86M\xa5\xe3p\xe7N \x00\x00\x00\x01\x00\x00\x00o\x05\x00\x000\x82\x05k0\x82\x03S\xa0\x03\x02\x01\x02\x02\x11\x00\x82\x10\xcf\xb0\xd2@\xe3YDc\xe0\xbbc\x82\x8b\x000 \x06 *\x86H\x86\xf7 \x01\x01\x0b\x05\x000O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Internet Security Research Group1\x150\x13\x06\x03U\x04\x03\x13\x0cISRG Root X10\x1e\x17 150604110438Z\x17 350604110438Z0O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Intern

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
CABD2A79A1076A31F21D253635CB039D4329A5E8
Blob = \x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x00\x10\x00\x00\x04\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00\x0c\xd2\xf9\xe0\xda\x17s\xe9\xed\x86M\xa5\xe3p\xe7N\x03\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00\xca\xbd*y\xa1\x07j1\xf2\x1d%65\xcb\x03\x9dC)\xa5\xe8\x1d\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00s\xb6\x87a\x95\xf5\xd1\x8e\x04\x85\x10B*\xef\x04\xe3\x14\x00\x00\x00\x01\x00\x00\x00\x14\x00\x00\x00y\xb4Y\xe6{\xb6\xe5\xe4\x01s\x80\x08\x88\xc8\x1aX\xf6\xe9\x9bn \x00\x00\x00\x01\x00\x00\x00\x16\x00\x00\x000\x14\x06\x08+\x06\x01\x05\x05\x07\x03\x02\x06\x08+\x06\x01\x05\x05\x07\x03\x01\x0b\x00\x00\x00\x01\x00\x00\x00\x1a\x00\x00\x00I\x00S\x00R\x00G\x00 \x00R\x00o\x00o\x00t\x00 \x00X\x001\x00\x00\x00b\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00\x96\xbc\xec\x06&Iv\xf3t`w\x9a\xcf(\xc5\xa7\xcf\xe8\xa3\xc0\xaa\xe1\x1a\x8f\xfc\xee\x05\xc0\xbd\xdf\x08\xc6\x0f\x00\x00\x00\x01\x00\x00\x00 \x00\x00\x00?\x04\x11\xed\xe9\xc4GpW\xd5~W\x88;\x1f [ \xcd\xc0\xf3&1)\xb1\xee\x02i\xa2g\x8fc\x19\x00\x00\x00\x01\x00\x00\x00\x10\x00\x00\x00/\xe1\xf7\x0b\xb0]|\x923[\xc5\xe0[\x98M\xa6 \x00\x00\x00\x01\x00\x00\x00o\x05\x00\x000\x82\x05k0\x82\x03S\xa0\x03\x02\x01\x02\x02\x11\x00\x82\x10\xcf\xb0\xd2@\xe3YDc\xe0\xbbc\x82\x8b\x000 \x06 *\x86H\x86\xf7 \x01\x01\x0b\x05\x000O1\x0b0 \x06\x03U\x04\x06\x13\x02US1)0'\x06\x03U\x04 \x13 Internet Security Research Group1\x150\x13\x06\x03U\x04\x03\x13\x0cISRG Root X10\x1e\x17 150604110438Z\x17 350604110438Z0O1\x0b0 \x06\x03U\x04\x06\x13\x02US1

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.10
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.75
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.200
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.93
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.118
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.65
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.248
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.46
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.48
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.21
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.65
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.118
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.12
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.107
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.86
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.153
  • https://{BLOCKED}.{BLOCKED}.{BLOCKED}.86
  • http://{BLOCKED}i.su/img/PXN5J/
  • http://{BLOCKED}cara.com.br/ava/ahhz/
  • http://{BLOCKED}ite.5v.pl/vendor/hvlVMsI9jGafBBTa/
  • http://{BLOCKED}v.pl/404.html
  • http://www.p{BLOCKED}h-crewing.com/aboutus/EUzMzX7yXpP/
  • http://{BLOCKED}a.sglwebs.com/img/2mmLuv7SxhhYFRVn/
  • http://{BLOCKED}om.com/bitrix/9HrzPY66D1F/
  • http://{BLOCKED}t.fit/site_vp/4PwK3s6Bf9K7TEA/

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.446.04

FIRST VSAPI PATTERN DATE:

15 May 2023

VSAPI OPR PATTERN File:

18.447.00

VSAPI OPR PATTERN Date:

16 May 2023

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8
    • Blob = {default value}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\CABD2A79A1076A31F21D253635CB039D4329A5E8
    • Blob = {default value}

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\Cab{Random 4 numbers}.tmp
  • %User Temp%\Tar{Random 4 numbers}.tmp
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll
  • %User Temp%\rad{random hex}.tmp.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.VBS.EMOTET.0NA103CH23. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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