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Trojan.Win32.SHELMA.ANM

December 17, 2019
 Analysis by: Arianne Grace Dela Cruz
 ALIASES:

Trojan.Win64.Shelma.alw (KASPERSKY); Trojan.Python.Agent (IKARUS)

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

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

  TECHNICAL DETAILS

File Size:

6,466,961 bytes

File Type:

EXE

Initial Samples Received Date:

17 Jan 2019

Arrival Details

This Trojan 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 adds the following folders:

  • %User Temp%\_MEI2242
  • %User Temp%\_MEI2242\Include
  • %User Temp%\_MEI2242\certifi
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info

(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).)

It drops the following files:

  • %User Temp%\_MEI2242\Crypto.Cipher._AES.pyd
  • %User Temp%\_MEI2242\Crypto.Cipher._ARC4.pyd
  • %User Temp%\_MEI2242\Crypto.Cipher._DES.pyd
  • %User Temp%\_MEI2242\Crypto.Cipher._DES3.pyd
  • %User Temp%\_MEI2242\Crypto.Hash._MD4.pyd
  • %User Temp%\_MEI2242\Crypto.Hash._SHA256.pyd
  • %User Temp%\_MEI2242\Crypto.Random.OSRNG.winrandom.pyd
  • %User Temp%\_MEI2242\Crypto.Util._counter.pyd
  • %User Temp%\_MEI2242\Crypto.Util.strxor.pyd
  • %User Temp%\_MEI2242\Microsoft.VC90.CRT.manifest
  • %User Temp%\_MEI2242\MyExploiter.exe.manifest
  • %User Temp%\_MEI2242\_cffi_backend.pyd
  • %User Temp%\_MEI2242\_ctypes.pyd
  • %User Temp%\_MEI2242\_hashlib.pyd
  • %User Temp%\_MEI2242\_socket.pyd
  • %User Temp%\_MEI2242\_ssl.pyd
  • %User Temp%\_MEI2242\bz2.pyd
  • %User Temp%\_MEI2242\cryptography.hazmat.bindings._constant_time.pyd
  • %User Temp%\_MEI2242\cryptography.hazmat.bindings._openssl.pyd
  • %User Temp%\_MEI2242\msvcm90.dll
  • %User Temp%\_MEI2242\msvcp90.dll
  • %User Temp%\_MEI2242\msvcr90.dll
  • %User Temp%\_MEI2242\pyexpat.pyd
  • %User Temp%\_MEI2242\python27.dll
  • %User Temp%\_MEI2242\select.pyd
  • %User Temp%\_MEI2242\unicodedata.pyd
  • %User Temp%\_MEI2242\Include\pyconfig.h
  • %User Temp%\_MEI2242\certifi\cacert.pem
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\AUTHORS.rst
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\INSTALLER
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\LICENSE
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\LICENSE.APACHE
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\LICENSE.BSD
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\METADATA
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\RECORD
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\WHEEL
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\top_level.txt

(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 deletes the following files:

  • %User Temp%\_MEI2242\Crypto.Cipher._AES.pyd
  • %User Temp%\_MEI2242\Crypto.Cipher._ARC4.pyd
  • %User Temp%\_MEI2242\Crypto.Cipher._DES.pyd
  • %User Temp%\_MEI2242\Crypto.Cipher._DES3.pyd
  • %User Temp%\_MEI2242\Crypto.Hash._MD4.pyd
  • %User Temp%\_MEI2242\Crypto.Hash._SHA256.pyd
  • %User Temp%\_MEI2242\Crypto.Random.OSRNG.winrandom.pyd
  • %User Temp%\_MEI2242\Crypto.Util._counter.pyd
  • %User Temp%\_MEI2242\Crypto.Util.strxor.pyd
  • %User Temp%\_MEI2242\Microsoft.VC90.CRT.manifest
  • %User Temp%\_MEI2242\MyExploiter.exe.manifest
  • %User Temp%\_MEI2242\_cffi_backend.pyd
  • %User Temp%\_MEI2242\_ctypes.pyd
  • %User Temp%\_MEI2242\_hashlib.pyd
  • %User Temp%\_MEI2242\_socket.pyd
  • %User Temp%\_MEI2242\_ssl.pyd
  • %User Temp%\_MEI2242\bz2.pyd
  • %User Temp%\_MEI2242\cryptography.hazmat.bindings._constant_time.pyd
  • %User Temp%\_MEI2242\cryptography.hazmat.bindings._openssl.pyd
  • %User Temp%\_MEI2242\msvcm90.dll
  • %User Temp%\_MEI2242\msvcp90.dll
  • %User Temp%\_MEI2242\msvcr90.dll
  • %User Temp%\_MEI2242\pyexpat.pyd
  • %User Temp%\_MEI2242\python27.dll
  • %User Temp%\_MEI2242\select.pyd
  • %User Temp%\_MEI2242\unicodedata.pyd
  • %User Temp%\_MEI2242\Include\pyconfig.h
  • %User Temp%\_MEI2242\certifi\cacert.pem
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\AUTHORS.rst
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\INSTALLER
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\LICENSE
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\LICENSE.APACHE
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\LICENSE.BSD
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\METADATA
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\RECORD
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\WHEEL
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info\top_level.txt

(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).)

It deletes the following folders:

  • %User Temp%\_MEI2242
  • %User Temp%\_MEI2242\Include
  • %User Temp%\_MEI2242\certifi
  • %User Temp%\_MEI2242\cryptography-2.4.2-py2.7.egg-info

(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 Details

This Trojan requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.756.03

FIRST VSAPI PATTERN DATE:

17 Jan 2019

VSAPI OPR PATTERN File:

14.757.00

VSAPI OPR PATTERN Date:

18 Jan 2019

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

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.SHELMA.ANM. 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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