Analysis by: Michael Jay Villanueva
ALIASES:

JS/Nemucod.CPL!tr (Fortinet)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

Tamaño del archivo 1,126 bytes
Tipo de archivo JS
Fecha de recepción de las muestras iniciales 31 Mar 2017

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Download Routine

This Trojan saves the files it downloads using the following names:

  • %User Temp%\a.doc
  • %User Temp%\a1.exe
  • %User Temp%\a2.exe

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

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}djimmy.com/counter/?0000001NybnppLvXE3C65DmPvdcZPC1p2QPop1LBTXUG8RcpAFtq56oDDzaeQTm4YIrtQ64bffBvqW2X4G6gYv8ap6eO1wmOeISB7p1MkRpPG20S8EgL2yJQ7kF2DQ0
  • http://{BLOCKED}djimmy.com/counter/?0000001NybnppLvXE3C65DmPvdcZPC1p2QPop1LBTXUG8RcpAFtq56oDDzaeQTm4YIrtQ64bffBvqW2X4G6gYv8ap6eO1wmOeISB7p1MkRpPG20S8EgL2yJQ7kF2DQ0
  • http://{BLOCKED}smnepal.com/counter/?0000001NybnppLvXE3C65DmPvdcZPC1p2QPop1LBTXUG8RcpAFtq56oDDzaeQTm4YIrtQ64bffBvqW2X4G6gYv8ap6eO1wmOeISB7p1MkRpPG20S8EgL2yJQ7kF2DQ0
  • http://{BLOCKED}enciabiblica2015.com/counter/?0000001NybnppLvXE3C65DmPvdcZPC1p2QPop1LBTXUG8RcpAFtq56oDDzaeQTm4YIrtQ64bffBvqW2X4G6gYv8ap6eO1wmOeISB7p1MkRpPG20S8EgL2yJQ7kF2DQ0
  • http://{BLOCKED}i.com/counter/?0000001NybnppLvXE3C65DmPvdcZPC1p2QPop1LBTXUG8RcpAFtq56oDDzaeQTm4YIrtQ64bffBvqW2X4G6gYv8ap6eO1wmOeISB7p1MkRpPG20S8EgL2yJQ7kF2DQ0
  • http://ah.{BLOCKED}h.com/counter/?0000001NybnppLvXE3C65DmPvdcZPC1p2QPop1LBTXUG8RcpAFtq56oDDzaeQTm4YIrtQ64bffBvqW2X4G6gYv8ap6eO1wmOeISB7p1MkRpPG20S8EgL2yJQ7kF2DQ0
  • http://ah.{BLOCKED}h.com/counter/?1
  • http://ah.{BLOCKED}h.com/counter/?2

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 13.310.08
Primera fecha de publicación de patrones de VSAPI 31 Mar 2017
Versión de patrones OPR de VSAPI 13.311.00
Fecha de publicación de patrones OPR de VSAPI 01 Apr 2017

NOTES:
英語：

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

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  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
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