General

  • Target

    650f2409b85f546ee7345a8281edddd2b084152df6bb45778c958b31ab14d84b

  • Size

    578KB

  • Sample

    220119-skrlesbaa9

  • MD5

    dfbf1c3345fa6eecbc7625e48745bb5d

  • SHA1

    4052413e09323f822f5e4dcbd8a82ca376d6e26f

  • SHA256

    650f2409b85f546ee7345a8281edddd2b084152df6bb45778c958b31ab14d84b

  • SHA512

    269c4ed1dd5b2cfe93eaab0b0173762a1351630af91938f54f6da852a8feca1a51127e0ab57ca06d4fd36e2847595a47ebf6336f21e12b239bbaf65453676364

Malware Config

Targets

    • Target

      650f2409b85f546ee7345a8281edddd2b084152df6bb45778c958b31ab14d84b

    • Size

      578KB

    • MD5

      dfbf1c3345fa6eecbc7625e48745bb5d

    • SHA1

      4052413e09323f822f5e4dcbd8a82ca376d6e26f

    • SHA256

      650f2409b85f546ee7345a8281edddd2b084152df6bb45778c958b31ab14d84b

    • SHA512

      269c4ed1dd5b2cfe93eaab0b0173762a1351630af91938f54f6da852a8feca1a51127e0ab57ca06d4fd36e2847595a47ebf6336f21e12b239bbaf65453676364

    • Modifies Windows Defender Real-time Protection settings

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Downloads MZ/PE file

    • Executes dropped EXE

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

    • Checks BIOS information in registry

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

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Checks whether UAC is enabled

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Modify Existing Service

1
T1031

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Disabling Security Tools

1
T1089

Virtualization/Sandbox Evasion

1
T1497

Credential Access

Credentials in Files

2
T1081

Discovery

Query Registry

3
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

3
T1082

Collection

Data from Local System

2
T1005

Tasks