General

  • Target

    8ae2801911fe1a3f3a658e92aa56f2fa64b6838c6dd5e568d0c2606f0508e10b

  • Size

    429KB

  • Sample

    220521-c2hrvahhhk

  • MD5

    c00485b785ae12c5d6bd8402365664c7

  • SHA1

    ce4223bcd76e0705707489a32274d0ee9c82b3b8

  • SHA256

    8ae2801911fe1a3f3a658e92aa56f2fa64b6838c6dd5e568d0c2606f0508e10b

  • SHA512

    9c418551093520dd3e0d44847bf066ade6c32ac0e2bd594f1565e3b98356819eb204437df996a0ad47fa33129b1a4be1e923dd3aefd8b1bf2bacad758f30a367

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.fsicibd.com
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    SH23newaz

Extracted

Credentials

  • Protocol:
    smtp
  • Host:
    mail.fsicibd.com
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    SH23newaz

Targets

    • Target

      CompaniesListing2020_Office_USE_ONLY.exe

    • Size

      512KB

    • MD5

      d6ae3cd904a77882aa5f0cfb0b997de6

    • SHA1

      3dd3969961176986597fa5ef7977fbb5c2b82276

    • SHA256

      3a062094e4e4f6e4d0b2e81c2c8821a82e599d668faf93614bd7063cad01d690

    • SHA512

      2c9ec916fba63fd0e4957178eeb31b91903adbf885c1c93b88c5cda737ab1d0b4c71f62733e819e7dd5d43e138bcdc5354344aa4235731ec662e42a9aeba469e

    • AgentTesla

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

    • 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.

    • 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

    • Maps connected drives based on registry

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

    • 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

Virtualization/Sandbox Evasion

2
T1497

Modify Registry

1
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

5
T1012

Virtualization/Sandbox Evasion

2
T1497

System Information Discovery

4
T1082

Peripheral Device Discovery

1
T1120

Collection

Data from Local System

3
T1005

Email Collection

1
T1114

Tasks