Overview

overview

10

Static

static

3

common.dat.exe

windows10-2004-x64

10

common.dat.exe

windows11-21h2-x64

8

Sharing

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General

  • Target
    common.dat.exe
  • Size 13.2MB
  • Sample260520-yr29dshw4m
  • SHA256 eb535f04f75ce19372551d86f2e35e4e1714879a7c7c26e2923e5c9b922d45e7
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
efimerexecutionpersistencepyarmorpyinstallerspywarestealertrojan

Malware Config

Targets

    • Target
      common.dat.exe
    • Size 13.2MB
    • SHA256 eb535f04f75ce19372551d86f2e35e4e1714879a7c7c26e2923e5c9b922d45e7
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    executionefimerpersistencespywarestealertrojan

    • Family: Efimer

      Efimer is a trojan written in JS.

      trojanefimer

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

      execution

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

      spywarestealer

    • Accesses cryptocurrency files/wallets, possible credential harvesting

      spyware

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks