General

  • Target

    NEAS.4a41e0418949914320454262970d1c878a37b2c01b48a7e92047f536771bf6f9js_JC.unknown

  • Size

    7KB

  • Sample

    231019-whvrvahh2w

  • MD5

    e811c4c9c880e3fae8bfb0cd7be6a4f6

  • SHA1

    b329fe66df345f51d229f5b76069a1f1263a1c2b

  • SHA256

    4a41e0418949914320454262970d1c878a37b2c01b48a7e92047f536771bf6f9

  • SHA512

    64ddaa45cddf959f07dac85ac412e169964f70150c02b32c1ff941791b2ce609a3d824d371b37e05bf7e7ec21b2658b7d462a9d9bfaa5a694c673aeefd335108

  • SSDEEP

    48:6IDkWkpUJeT2nfw9LOABJCvs2LNL75q+tCqB5q04CXSR:8wm0JciBc0lo

Malware Config

Extracted

Credentials

  • Protocol:
    ftp
  • Host:
    ftp.martur.cl
  • Port:
    21
  • Username:
    admin@martur.cl
  • Password:
    (57reRWWw5dj

Extracted

Family

agenttesla

Credentials

  • Protocol:
    ftp
  • Host:
    ftp://ftp.martur.cl
  • Port:
    21
  • Username:
    admin@martur.cl
  • Password:
    (57reRWWw5dj

Extracted

Family

wshrat

C2

http://chongmei33.publicvm.com:7045

Targets

    • Target

      NEAS.4a41e0418949914320454262970d1c878a37b2c01b48a7e92047f536771bf6f9js_JC.unknown

    • Size

      7KB

    • MD5

      e811c4c9c880e3fae8bfb0cd7be6a4f6

    • SHA1

      b329fe66df345f51d229f5b76069a1f1263a1c2b

    • SHA256

      4a41e0418949914320454262970d1c878a37b2c01b48a7e92047f536771bf6f9

    • SHA512

      64ddaa45cddf959f07dac85ac412e169964f70150c02b32c1ff941791b2ce609a3d824d371b37e05bf7e7ec21b2658b7d462a9d9bfaa5a694c673aeefd335108

    • SSDEEP

      48:6IDkWkpUJeT2nfw9LOABJCvs2LNL75q+tCqB5q04CXSR:8wm0JciBc0lo

    • AgentTesla

      Agent Tesla is a remote access tool (RAT) written in visual basic.

    • WSHRAT

      WSHRAT is a variant of Houdini worm and has vbs and js variants.

    • WSHRAT payload

    • Blocklisted process makes network request

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

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

    • Adds Run key to start application

    • 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 v13

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Modify Registry

1
T1112

Credential Access

Unsecured Credentials

3
T1552

Credentials In Files

3
T1552.001

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Tasks