Overview

overview

9

Static

static

7

Yams_Servi...al.exe

windows7-x64

9

Yams_Servi...al.exe

windows10-2004-x64

9

Sharing

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General

  • Target

    Yams_Services_External.exe

  • Size

    3.5MB

  • Sample

    230330-w1bfxsfc2y

  • MD5

    4240b6c1ab4629acc3927253194bb347

  • SHA1

    2dd45eca03940f3ec406a41dab511aff46b12f28

  • SHA256

    d3084cfdaaddce936b27ab95f651c27633938ae844b7858d3871bbc56b4437b2

  • SHA512

    4998f70111505b755710b2eafd13e2c52b95ab68cdd15ab82c4d6b46c0388a0d72b03206b2074364a824c3e92265c4c6c34083b8e876c7b1f41e02d5818be435

  • SSDEEP

    98304:aJcv8AMTa1spzA7IcKgoUxdu+/y8QTrCsGT:e0EA7X4Uxdx/y8dT

Score
9/10
evasionpersistencethemidatrojan

Malware Config

Targets

    • Target

      Yams_Services_External.exe

    • Size

      3.5MB

    • MD5

      4240b6c1ab4629acc3927253194bb347

    • SHA1

      2dd45eca03940f3ec406a41dab511aff46b12f28

    • SHA256

      d3084cfdaaddce936b27ab95f651c27633938ae844b7858d3871bbc56b4437b2

    • SHA512

      4998f70111505b755710b2eafd13e2c52b95ab68cdd15ab82c4d6b46c0388a0d72b03206b2074364a824c3e92265c4c6c34083b8e876c7b1f41e02d5818be435

    • SSDEEP

      98304:aJcv8AMTa1spzA7IcKgoUxdu+/y8QTrCsGT:e0EA7X4Uxdx/y8dT

    Score
    9/10
    evasionthemidatrojanpersistence

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

      evasion

    • Downloads MZ/PE file

    • Sets service image path in registry

      persistence

    • Checks BIOS information in registry

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

    • Executes dropped EXE

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

      themida

    • Checks whether UAC is enabled

      evasiontrojan

    • Drops file in System32 directory

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1
T1060

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1
T1497

Modify Registry

1
T1112

Credential Access

Discovery

Query Registry

2
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

2
T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Tasks