General

  • Target

    55F22AA33B837E543E8A58408ED843E41515292DEAD43.exe

  • Size

    2.5MB

  • Sample

    221104-mkc55secf7

  • MD5

    23b40478a61a00df0473d1f56cc4ff62

  • SHA1

    64257c787846db476c4cd71464af58fae87b26a9

  • SHA256

    55f22aa33b837e543e8a58408ed843e41515292dead43b57b2ae42b735c34f11

  • SHA512

    3f861177bfafeaee6f682704b066a6c42242fb425fb79e4e43b28187d97b2c5b68717775f62962c7d169ac2de61fbec32079434b293523d95de17fd273479bf5

  • SSDEEP

    49152:xcBIPkZVi7iKiF8cUvFyPZGf5S8wK82iXCgEwJ84vLRaBtIl9mTcNFpaEjoLQKo5:x6ri7ixZUvFyPZu4IiXC3CvLUBsKcNFZ

Malware Config

Extracted

Family

nullmixer

C2

http://sokiran.xyz/

Extracted

Family

vidar

Version

39.6

Botnet

933

C2

https://sslamlssa1.tumblr.com/

Attributes
  • profile_id

    933

Targets

    • Target

      55F22AA33B837E543E8A58408ED843E41515292DEAD43.exe

    • Size

      2.5MB

    • MD5

      23b40478a61a00df0473d1f56cc4ff62

    • SHA1

      64257c787846db476c4cd71464af58fae87b26a9

    • SHA256

      55f22aa33b837e543e8a58408ed843e41515292dead43b57b2ae42b735c34f11

    • SHA512

      3f861177bfafeaee6f682704b066a6c42242fb425fb79e4e43b28187d97b2c5b68717775f62962c7d169ac2de61fbec32079434b293523d95de17fd273479bf5

    • SSDEEP

      49152:xcBIPkZVi7iKiF8cUvFyPZGf5S8wK82iXCgEwJ84vLRaBtIl9mTcNFpaEjoLQKo5:x6ri7ixZUvFyPZu4IiXC3CvLUBsKcNFZ

    • Detects Smokeloader packer

    • Modifies Windows Defender Real-time Protection settings

    • NullMixer

      NullMixer is a malware dropper leading to an infection chain of a wide variety of malware families.

    • PrivateLoader

      PrivateLoader is a downloader sold as a pay-per-install malware distribution service.

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • SmokeLoader

      Modular backdoor trojan in use since 2014.

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Vidar

      Vidar is an infostealer based on Arkei stealer.

    • Vidar Stealer

    • ASPack v2.12-2.42

      Detects executables packed with ASPack v2.12-2.42

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Checks computer location settings

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

    • Loads dropped DLL

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Modify Existing Service

1
T1031

Defense Evasion

Modify Registry

2
T1112

Disabling Security Tools

1
T1089

Install Root Certificate

1
T1130

Discovery

Query Registry

2
T1012

System Information Discovery

3
T1082

Peripheral Device Discovery

1
T1120

Command and Control

Web Service

1
T1102

Tasks