General

  • Target

    RF Oferta_07102021.doc

  • Size

    500KB

  • Sample

    211007-n3f57aceej

  • MD5

    c977721c2b6e22a4bb29bc723e88dc14

  • SHA1

    33e5d7488767291024cbf2581fbe360384c7d67a

  • SHA256

    1c9bbe414128de9b946727e8ac7fe2edf9c28731fabbc564dee935a97721d358

  • SHA512

    93cc581978c4b35f743a6bcd7eb48efe590141be3d4f636e44b6a000332ccd4007745aa014806d3375f485a7db3ddf7630b2b24c71093eebeb890786c1603d3b

Malware Config

Extracted

Language
ps1
Deobfuscated
URLs
exe.dropper

httP://avira.ydns.eu/EXCEL.exe

Extracted

Family

xpertrat

Version

3.0.10

Botnet

Test

C2

kapasky-antivirus.firewall-gateway.net:4000

Mutex

L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0

Targets

    • Target

      RF Oferta_07102021.doc

    • Size

      500KB

    • MD5

      c977721c2b6e22a4bb29bc723e88dc14

    • SHA1

      33e5d7488767291024cbf2581fbe360384c7d67a

    • SHA256

      1c9bbe414128de9b946727e8ac7fe2edf9c28731fabbc564dee935a97721d358

    • SHA512

      93cc581978c4b35f743a6bcd7eb48efe590141be3d4f636e44b6a000332ccd4007745aa014806d3375f485a7db3ddf7630b2b24c71093eebeb890786c1603d3b

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • UAC bypass

    • Windows security bypass

    • XpertRAT

      XpertRAT is a remote access trojan with various capabilities.

    • XpertRAT Core Payload

    • Adds policy Run key to start application

    • Blocklisted process makes network request

    • Downloads MZ/PE file

    • Executes dropped EXE

    • Loads dropped DLL

    • Windows security modification

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

2
T1060

Privilege Escalation

Bypass User Account Control

1
T1088

Defense Evasion

Bypass User Account Control

1
T1088

Disabling Security Tools

3
T1089

Modify Registry

7
T1112

Discovery

System Information Discovery

4
T1082

Query Registry

2
T1012

Tasks