General

  • Target

    dropper.bat

  • Size

    3KB

  • Sample

    240619-zw91gawcnr

  • MD5

    b39d7e16dc19bb1d6bf046c88e66bdc6

  • SHA1

    3982666db1f0552cd5d9e4aa12cadfe6d3c6ddd7

  • SHA256

    7230c62275c90bdb5400ef4e95aea9d0e2ffef55e9080a2a6a7336ed902c9ea5

  • SHA512

    9b47a888f1b9e53fcd50a94c04fb43443221461eac57c1203ba673060dea5b50520a31df6d5b368e54aad6b10d1a13bf43ebc0864765150a89d58beffcbb11a0

Malware Config

Targets

    • Target

      dropper.bat

    • Size

      3KB

    • MD5

      b39d7e16dc19bb1d6bf046c88e66bdc6

    • SHA1

      3982666db1f0552cd5d9e4aa12cadfe6d3c6ddd7

    • SHA256

      7230c62275c90bdb5400ef4e95aea9d0e2ffef55e9080a2a6a7336ed902c9ea5

    • SHA512

      9b47a888f1b9e53fcd50a94c04fb43443221461eac57c1203ba673060dea5b50520a31df6d5b368e54aad6b10d1a13bf43ebc0864765150a89d58beffcbb11a0

    • AsyncRat

      AsyncRAT is designed to remotely monitor and control other computers written in C#.

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Async RAT payload

    • Downloads MZ/PE file

    • 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

    • Adds Run key to start application

    • Legitimate hosting services abused for malware hosting/C2

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v13

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Access Token Manipulation

1
T1134

Create Process with Token

1
T1134.002

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Modify Registry

1
T1112

Access Token Manipulation

1
T1134

Create Process with Token

1
T1134.002

Discovery

Query Registry

6
T1012

System Information Discovery

6
T1082

Peripheral Device Discovery

1
T1120

Command and Control

Web Service

1
T1102

Tasks