General

  • Target

    download.txt

  • Size

    27B

  • Sample

    230408-b4rbbsdd41

  • MD5

    e94a00363c4c886c9cc8e7193d956342

  • SHA1

    19667b9ef43d509c3807b3887bd26cc6c9c825b5

  • SHA256

    706a6ec9127dd25443833466eedebdb430f92a4b17160ed75c13183d6627ca59

  • SHA512

    71bde0fedcbe29e8f7b99480f0b9ea9bfd681d7b74bbd5b488273b2b76b0662905a9c84c3a1211fa329c261aa41606c227bb4ff178926fe00314aa4fdaf12883

Malware Config

Extracted

Family

gcleaner

C2

85.31.45.39

85.31.45.250

85.31.45.251

85.31.45.88

Targets

    • Target

      download.txt

    • Size

      27B

    • MD5

      e94a00363c4c886c9cc8e7193d956342

    • SHA1

      19667b9ef43d509c3807b3887bd26cc6c9c825b5

    • SHA256

      706a6ec9127dd25443833466eedebdb430f92a4b17160ed75c13183d6627ca59

    • SHA512

      71bde0fedcbe29e8f7b99480f0b9ea9bfd681d7b74bbd5b488273b2b76b0662905a9c84c3a1211fa329c261aa41606c227bb4ff178926fe00314aa4fdaf12883

    • GCleaner

      GCleaner is a Pay-Per-Install malware loader first discovered in early 2019.

    • Blocklisted process makes network request

    • Downloads MZ/PE file

    • ACProtect 1.3x - 1.4x DLL software

      Detects file using ACProtect software.

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • 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.

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

    • Adds Run key to start application

    • Checks for any installed AV software in registry

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Creates a large amount of network flows

      This may indicate a network scan to discover remotely running services.

    • Drops Chrome extension

    • Looks up external IP address via web service

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

    • Drops file in System32 directory

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Registry Run Keys / Startup Folder

1
T1060

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Defense Evasion

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

6
T1012

System Information Discovery

5
T1082

Security Software Discovery

1
T1063

Network Service Scanning

1
T1046

Collection

Data from Local System

1
T1005

Tasks