General

  • Target

    effp.exe

  • Size

    15KB

  • Sample

    210120-kcmkvc455a

  • MD5

    1983ead6d04607d63ca056ec796fb87f

  • SHA1

    a437a10a281b78b7e7d87049a7864ed9fb2dc765

  • SHA256

    74e35db0e018a83a1002237e7521e2cc0f2d03c6befa319d2b55c68f248f5bbd

  • SHA512

    f4c195487428ed46830bf5047c87614d575adb871e8e8e32bb9eb9806be07b8076a78903288b5d7323e5930f5a4b7ef914bd25b0c5d7dc59dad7c445441e6c8b

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.privateemail.com
  • Port:
    587
  • Username:
    nancy.chen@exxacitcorp.com
  • Password:
    LifeDram2021

Targets

    • Target

      effp.exe

    • Size

      15KB

    • MD5

      1983ead6d04607d63ca056ec796fb87f

    • SHA1

      a437a10a281b78b7e7d87049a7864ed9fb2dc765

    • SHA256

      74e35db0e018a83a1002237e7521e2cc0f2d03c6befa319d2b55c68f248f5bbd

    • SHA512

      f4c195487428ed46830bf5047c87614d575adb871e8e8e32bb9eb9806be07b8076a78903288b5d7323e5930f5a4b7ef914bd25b0c5d7dc59dad7c445441e6c8b

    • AgentTesla

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

    • Modifies WinLogon for persistence

    • Modifies Windows Defender Real-time Protection settings

    • Turns off Windows Defender SpyNet reporting

    • Windows security bypass

    • AgentTesla Payload

    • Looks for VirtualBox Guest Additions in registry

    • 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

    • 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.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

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

4
T1089

Virtualization/Sandbox Evasion

2
T1497

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

4
T1012

Virtualization/Sandbox Evasion

2
T1497

System Information Discovery

3
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

3
T1005

Command and Control

Web Service

1
T1102

Tasks