Analysis by: Wilbert Vidal
ALIASES:

PUA:Win32/KuaiZip (Microsoft); Generic PUA IE (PUA) (Sophos AV)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Potentially Unwanted Application 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: 1,690,008 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 03 Jun 2018

Arrival Details

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

Other System Modifications

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\KuaiZip\
Report\offline\{malware name}.exe-.minitype-empty

HKEY_CURRENT_USER\Software\KuaiZip\
Report\offline

HKEY_CURRENT_USER\Software\KuaiZip\
Report

HKEY_CURRENT_USER\Software\KuaiZip

It adds the following registry entries:

HKEY_CURRENT_USER\Software\KuaiZip\
Report\offline\{malware name}.exe-.minitype-empty
code = \xa6\xb1\xc6\x8f\x17&\xd9\x886g>\xb9\x114%\xcb]\xa6\xd5TKY\xed\x7f"\xa2C8\x1f

HKEY_CURRENT_USER\Software\KuaiZip\
Report\offline\{malware name}.exe-.minitype-empty
path = r4\xfe\x03\xdc\xa6\x9e\xa4\x8f \xceN4#=}\xfec\xa7\x02\xd4\xda-\xf3\x81\x8c\x9b

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

  • eat{BLOCKED}.xiaoxi{BLOCKED}bz.com

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 1.968.44
FIRST VSAPI PATTERN DATE: 04 Jun 2018
VSAPI OPR PATTERN File: 1.969.00
VSAPI OPR PATTERN Date: 05 Jun 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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

Delete this 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_CURRENT_USER\Software\KuaiZip\Report\offline\{malware name}.exe-.minitype-empty
    • path = \xa6\xb1\xc6\x8f\x17&\xd9\x886g>\xb9\x114%\xcb]\xa6\xd5TKY\xed\x7f"\xa2C8\x1f
  • In HKEY_CURRENT_USER\Software\KuaiZip\Report\offline\{malware name}.exe-.minitype-empty
    • code = r4\xfe\x03\xdc\xa6\x9e\xa4\x8f \xceN4#=}\xfec\xa7\x02\xd4\xda-\xf3\x81\x8c\x9b

Step 4

Scan your computer with your Trend Micro product to delete files detected as PUA_KuaiZip.GA. 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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