General

  • Target

    eef4b9da665969c538717fecd8ae1c0ae2948e09ab86745f2b847aedf1b3fee8

  • Size

    184KB

  • Sample

    230217-rbrz6afg22

  • MD5

    349971557e88ced0c1c06877525daa27

  • SHA1

    88c74c2b2dc0226a6e2a8f734c85ded9e2af47f8

  • SHA256

    eef4b9da665969c538717fecd8ae1c0ae2948e09ab86745f2b847aedf1b3fee8

  • SHA512

    87102f7d9d2cddf490e411ffbc00247cd0edae307b3bddbfb09f3a3fd4d93913b14376af642ee31ae1d80f2e5e61a677d572fc3d35233a9609f52ba5fd983bae

  • SSDEEP

    3072:x/BgPvTmL4bjsuPJqZGmtKG1g1OZ6PWvXI6b/VkTYY49ID9pCtDm:x/+NXsuhMREG+1VII6bVpcD9Q

Malware Config

Targets

    • Target

      eef4b9da665969c538717fecd8ae1c0ae2948e09ab86745f2b847aedf1b3fee8

    • Size

      184KB

    • MD5

      349971557e88ced0c1c06877525daa27

    • SHA1

      88c74c2b2dc0226a6e2a8f734c85ded9e2af47f8

    • SHA256

      eef4b9da665969c538717fecd8ae1c0ae2948e09ab86745f2b847aedf1b3fee8

    • SHA512

      87102f7d9d2cddf490e411ffbc00247cd0edae307b3bddbfb09f3a3fd4d93913b14376af642ee31ae1d80f2e5e61a677d572fc3d35233a9609f52ba5fd983bae

    • SSDEEP

      3072:x/BgPvTmL4bjsuPJqZGmtKG1g1OZ6PWvXI6b/VkTYY49ID9pCtDm:x/+NXsuhMREG+1VII6bVpcD9Q

    • Detects Smokeloader packer

    • SmokeLoader

      Modular backdoor trojan in use since 2014.

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

    • Downloads MZ/PE file

    • Checks BIOS information in registry

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

    • Executes dropped EXE

    • Obfuscated with Agile.Net obfuscator

      Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Legitimate hosting services abused for malware hosting/C2

    • Detected potential entity reuse from brand microsoft.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Virtualization/Sandbox Evasion

1
T1497

Modify Registry

1
T1112

Discovery

Query Registry

4
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

5
T1082

Peripheral Device Discovery

1
T1120

Command and Control

Web Service

1
T1102

Tasks