skuld | 16b9f580660a174e0d3f2b23cdf4de6fe82deefcd75192464bff2bd584a3c2b4

Analysis

max time kernel
155s
max time network
280s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250113-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250113-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
17-01-2025 21:01

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General

Target

BootStrapper (1).exe
Size

3.2MB
MD5

0442d033d1e0b18c6dbf9e7f57039da5
SHA1

ee9b1d948d6b3237f3a64cda561d0efaa2a4e164
SHA256

16b9f580660a174e0d3f2b23cdf4de6fe82deefcd75192464bff2bd584a3c2b4
SHA512

7f9afb2ed2a87a2bd690ec41dbb7f2e62bb0b6c789df59ed0610adbec88c96bd1418ef36a52d8d18d1d9d47ae98bd0871673879f186ca14190259f286d80ee0b
SSDEEP

98304:lYsufBjM2jH5ayXnfvf1KXZFHwVExjMf/tLIMrTF:lYsGjL3NKXTH1VM+mF

Score

10^/10

skuld persistence stealer upx

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1329903513274155171/z1jphWz7v3gjJ0vhCWrkHcKKPLGjaxj55asRwGClmgW2MKIcHFdOmwUdV4yEr8m6I-my

Signatures

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4069049685-955655941-4058287599-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	BootStrapper (1).exe

UPX packed file 2 IoCs

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

upx

resource	yara_rule
behavioral1/memory/3108-0-0x0000000000D50000-0x0000000001797000-memory.dmp	upx
behavioral1/memory/3108-1-0x0000000000D50000-0x0000000001797000-memory.dmp	upx

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3108	BootStrapper (1).exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3108 wrote to memory of 1172	3108	BootStrapper (1).exe	82
PID 3108 wrote to memory of 1172	3108	BootStrapper (1).exe	82

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1172	attrib.exe

C:\Users\Admin\AppData\Local\Temp\BootStrapper (1).exe
"C:\Users\Admin\AppData\Local\Temp\BootStrapper (1).exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3108
- C:\Windows\system32\attrib.exe
  attrib +h +s "C:\Users\Admin\AppData\Local\Temp\BootStrapper (1).exe"
  2⤵
  - Views/modifies file attributes
  PID:1172

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/3108-0-0x0000000000D50000-0x0000000001797000-memory.dmp

Filesize
10.3MB

Download
memory/3108-1-0x0000000000D50000-0x0000000001797000-memory.dmp

Filesize
10.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads