skuld | bdfc7afbb8e9da764dfd6256b289214a58a42aa43f195a2a475004f65508d9aa

Analysis

max time kernel
102s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
24/03/2025, 23:03

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General

Target

skuld_protected.exe
Size

8.2MB
MD5

53171de70bb7139d01253475b3edf69d
SHA1

d3653eeb3b0186f98d90906d31bba029abd4d7b3
SHA256

bdfc7afbb8e9da764dfd6256b289214a58a42aa43f195a2a475004f65508d9aa
SHA512

673650773974a99ab67c8560076421cd741c2e516ff073dbf2605a99881b5ae58afe39ea7ffaa813bfa995eec479cdb1e511cb503b334eb2088ce9cc3eb5a0d7
SSDEEP

196608:cu61rj+K0BAlTzhD5cPtodCbdYzgB4l8t0m3Kv26Hz83S0:0Z0MdcnpsRv6KvVTR0

Score

10^/10

skuld defense_evasion stealer themida trojan

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1353860432762372188/A1186uEBicdAwCu0FmKv96jtyFw-8SuTgxcvz4OTlmMYzeW-r7U2BlP4scfVJ8yH-jKr

Signatures

Skuld family
skuld
Skuld stealer
An info stealer written in Go lang.
stealer skuld

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	skuld_protected.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	skuld_protected.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	skuld_protected.exe

Themida packer 7 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/868-0-0x0000000000400000-0x0000000001907000-memory.dmp	themida
behavioral2/memory/868-2-0x0000000000400000-0x0000000001907000-memory.dmp	themida
behavioral2/memory/868-3-0x0000000000400000-0x0000000001907000-memory.dmp	themida
behavioral2/memory/868-4-0x0000000000400000-0x0000000001907000-memory.dmp	themida
behavioral2/memory/868-5-0x0000000000400000-0x0000000001907000-memory.dmp	themida
behavioral2/memory/868-6-0x0000000000400000-0x0000000001907000-memory.dmp	themida
behavioral2/memory/868-10-0x0000000000400000-0x0000000001907000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	skuld_protected.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
868	skuld_protected.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	868	skuld_protected.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 868 wrote to memory of 4960	868	skuld_protected.exe	100
PID 868 wrote to memory of 4960	868	skuld_protected.exe	100

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
4960	attrib.exe

C:\Users\Admin\AppData\Local\Temp\skuld_protected.exe
"C:\Users\Admin\AppData\Local\Temp\skuld_protected.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:868
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld_protected.exe
  2⤵
  - Views/modifies file attributes
  PID:4960

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/868-0-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download
memory/868-1-0x00007FFF6BF50000-0x00007FFF6BF52000-memory.dmp

Filesize
8KB

Download
memory/868-2-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download
memory/868-3-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download
memory/868-4-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download
memory/868-5-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download
memory/868-6-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download
memory/868-10-0x0000000000400000-0x0000000001907000-memory.dmp

Filesize
21.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads