General

  • Target

    YammyLoader.bin.zip

  • Size

    108KB

  • Sample

    220524-gjdsdsbaal

  • MD5

    c4b640c44324ea5c377d5c24fd15086a

  • SHA1

    a326be523846272fb4ea7bc98d4be85c359bea8b

  • SHA256

    f6553af26bd26235d620d64515b1742f62728fb672a68eee43977452ee3da63c

  • SHA512

    b275708f0d30ba6f547a2b78b82f74d3515797710ef4ff0cfbfe827795f90f0d09db1d3f5fb8b551294f22c57d4ed56eb95d545af0aed080450e45d8996bcf88

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/865278638920171560/PRv_h9uiyjk1_AT7W333rVQwQoum9eVlsbp96PiWNkYCzOjv6NlP7AX9lOzA3VhkP3qz

Targets

    • Target

      YammyLoader.bin

    • Size

      274KB

    • MD5

      d058d933c1f937a964c6c3ecd3c56a6b

    • SHA1

      1a698f15a55c1cf90c764e331b74a80194cba800

    • SHA256

      0902f659e8b8cad29f1e60defaf2e6389f2e94044e4995638b04a4c659bd134c

    • SHA512

      8c91a82e29edc4e7614f1f6cae38951301560168acd2bc656d12b7774729e5977bb28feba6a9fcc09dac13ef9dd98c04a3bce80914a3233e3708965e134db0da

    • 44Caliber

      An open source infostealer written in C#.

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Checks computer location settings

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

    • Loads dropped DLL

    • Reads local data of messenger clients

      Infostealers often target stored data of messaging applications, which can include saved credentials and account information.

    • Reads user/profile data of web browsers

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

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Adds Run key to start application

    • Checks installed software on the system

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

    • 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.

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

5
T1012

System Information Discovery

5
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

3
T1005

Command and Control

Web Service

1
T1102

Tasks