General

  • Target

    PO2100135.doc

  • Size

    129KB

  • Sample

    210120-1f7grmbb22

  • MD5

    abb6916bdf5c4028fa49c614c200f180

  • SHA1

    79017f043d266043ce042fa654c89b8af9c163f4

  • SHA256

    6810cc6edb1ced93f416b478d0d793b3a01bcfd37d8927388fd55ec2b1086e29

  • SHA512

    52b89f3d1a578fbe04d567b06d049f1ddb3cde5f0f9305bc47998df2a1790ddb63d12ec32ddc4657a381a55144929b03c96c519726ae1ade2a93a272b9eb1fe6

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.privateemail.com
  • Port:
    587
  • Username:
    admin@adipico.com
  • Password:
    HELPMELORD@2021

Targets

    • Target

      PO2100135.doc

    • Size

      129KB

    • MD5

      abb6916bdf5c4028fa49c614c200f180

    • SHA1

      79017f043d266043ce042fa654c89b8af9c163f4

    • SHA256

      6810cc6edb1ced93f416b478d0d793b3a01bcfd37d8927388fd55ec2b1086e29

    • SHA512

      52b89f3d1a578fbe04d567b06d049f1ddb3cde5f0f9305bc47998df2a1790ddb63d12ec32ddc4657a381a55144929b03c96c519726ae1ade2a93a272b9eb1fe6

    • AgentTesla

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

    • Modifies WinLogon for persistence

    • Modifies Windows Defender Real-time Protection settings

    • Windows security bypass

    • AgentTesla Payload

    • Looks for VirtualBox Guest Additions in registry

    • Blocklisted process makes network request

    • Executes dropped EXE

    • Looks for VMWare Tools registry key

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Drops startup file

    • Loads dropped DLL

    • 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.

    • Windows security modification

    • Adds Run key to start application

    • Legitimate hosting services abused for malware hosting/C2

    • Maps connected drives based on registry

      Disk information is often read in order to detect sandboxing environments.

    • Drops file in System32 directory

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Execution

Exploitation for Client Execution

1
T1203

Persistence

Winlogon Helper DLL

1
T1004

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

6
T1112

Disabling Security Tools

3
T1089

Virtualization/Sandbox Evasion

2
T1497

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

6
T1012

Virtualization/Sandbox Evasion

2
T1497

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