General

  • Target

    19bd376d4febdfc512a5e1242c79a9a0e2b77c007a09ae07b05a656957a42618

  • Size

    662KB

  • Sample

    220521-pynvxagbh4

  • MD5

    101543f1806d201c652031dab1181b94

  • SHA1

    dae91b6a5431d0daf8fc578477df10c2812bb9f2

  • SHA256

    19bd376d4febdfc512a5e1242c79a9a0e2b77c007a09ae07b05a656957a42618

  • SHA512

    0b5845f63b7a5842f839400ac332129b93113e315798d6e27ed152c8dfef769adfa0abe0b2cbcf9fc768039537451707b2708f855424890315745de2e1742f6c

Malware Config

Targets

    • Target

      Purchase Order.exe

    • Size

      601KB

    • MD5

      8b622390bd7c3a881878b740857c506b

    • SHA1

      2f683c3dd410f542383eebfaa033dc3c47d1afec

    • SHA256

      7a53181aa1e3f435bf2036ddff15a7e8e3382bfceade53abd9f3a6e14ed2cf5b

    • SHA512

      73df2a62e0f389f4bcbae6b012ea0ba82bcc335a21746efcfd9f34d0d712249a743ea78d845e8d08abbf492ceb8471135af98489a2857630d8c5d3f60691a83b

    • 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