General

  • Target

    09f71363eeae20550c65800031e142057ca1ebe52be382b0cdc4ad35d8ddba1e

  • Size

    336KB

  • Sample

    220524-1nsa5ahbe5

  • MD5

    756dacf76917f79f5795958815e6dcf7

  • SHA1

    24f293e12498264c32d356ad42127cf950b10018

  • SHA256

    09f71363eeae20550c65800031e142057ca1ebe52be382b0cdc4ad35d8ddba1e

  • SHA512

    c7a20e179e8cb2602fd4d93817ac14202286afa6763abd64cd18627bafdcded056e17263966ea929bf42bb27483653845f1fd059723ddd0030cfe16bd091bacb

Malware Config

Targets

    • Target

      DOCUMENT.exe

    • Size

      402KB

    • MD5

      80a0e44a0b9428e5c1c22669de4199c2

    • SHA1

      62a712d3b5ffcd9e63a4d91899b05c0fb11e03f3

    • SHA256

      02a155cd37b9928135915cc0ca32e4bb683335d1bc1fadec09bd667917e2c734

    • SHA512

      6a462ab876c1995bc8d1e42be965e31bedb395b831cddd3b8b0b1c68a0610a1efff0615d2baf630d924b03c27556ce763478bbda2a36e125b0b63b43024e8bb3

    • AgentTesla

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

    • AgentTesla Payload

    • ReZer0 packer

      Detects ReZer0, a packer with multiple versions used in various campaigns.

    • Checks computer location settings

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

    • 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.

    • Accesses Microsoft Outlook profiles

    • 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 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

1
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Email Collection

1
T1114

Tasks