skuld | 5c4c6ef3aed460f7ea15025bc160768e00c988747b943c99faf9f09b73f86e18

General

Target

RobloxPlayerLauncher.exe
Size

9.9MB
MD5

5c5df6c4b78bfb7d355e572b6cfce6d2
SHA1

830265d6a2765a753e9d9dee7b9a889aa025fb5b
SHA256

5c4c6ef3aed460f7ea15025bc160768e00c988747b943c99faf9f09b73f86e18
SHA512

ea058263672e14bd4c3730d471489a04f97ba697eb9fbae4ff5e6c735f3438c99720cbe3a308bd25d081006be54b0ac77c4f43839dd57abb6408e2f4781e7689
SSDEEP

98304:BzU4brhxBASgf/gEpiji6Ig8TWAREIICafZm/mbnXg:BxrhxBAGZji6IdThyRTXg

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1299276926313168939/nUyg4ujtj0ahOQ9bQrsonhIejMu_TEy5WSbSW1zNiMPvu82xYEoKx__3y8ucAcZ122uh

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

Processes:

RobloxPlayerLauncher.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	RobloxPlayerLauncher.exe

Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

3 api.ipify.org
4 api.ipify.org
10 ip-api.com
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.

Processes:

description flow ioc

HTTP User-Agent header 11 Go-http-client/1.1

flow	ioc
3	api.ipify.org
4	api.ipify.org
10	ip-api.com

description	flow	ioc
HTTP User-Agent header	11	Go-http-client/1.1

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

Processes:

RobloxPlayerLauncher.exe

description	ioc	process
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	RobloxPlayerLauncher.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C	RobloxPlayerLauncher.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	RobloxPlayerLauncher.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

Processes:

RobloxPlayerLauncher.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	4320	RobloxPlayerLauncher.exe
Token: SeIncreaseQuotaPrivilege	4536	wmic.exe
Token: SeSecurityPrivilege	4536	wmic.exe
Token: SeTakeOwnershipPrivilege	4536	wmic.exe
Token: SeLoadDriverPrivilege	4536	wmic.exe
Token: SeSystemProfilePrivilege	4536	wmic.exe
Token: SeSystemtimePrivilege	4536	wmic.exe
Token: SeProfSingleProcessPrivilege	4536	wmic.exe
Token: SeIncBasePriorityPrivilege	4536	wmic.exe
Token: SeCreatePagefilePrivilege	4536	wmic.exe
Token: SeBackupPrivilege	4536	wmic.exe
Token: SeRestorePrivilege	4536	wmic.exe
Token: SeShutdownPrivilege	4536	wmic.exe
Token: SeDebugPrivilege	4536	wmic.exe
Token: SeSystemEnvironmentPrivilege	4536	wmic.exe
Token: SeRemoteShutdownPrivilege	4536	wmic.exe
Token: SeUndockPrivilege	4536	wmic.exe
Token: SeManageVolumePrivilege	4536	wmic.exe
Token: 33	4536	wmic.exe
Token: 34	4536	wmic.exe
Token: 35	4536	wmic.exe
Token: 36	4536	wmic.exe
Token: SeIncreaseQuotaPrivilege	4536	wmic.exe
Token: SeSecurityPrivilege	4536	wmic.exe
Token: SeTakeOwnershipPrivilege	4536	wmic.exe
Token: SeLoadDriverPrivilege	4536	wmic.exe
Token: SeSystemProfilePrivilege	4536	wmic.exe
Token: SeSystemtimePrivilege	4536	wmic.exe
Token: SeProfSingleProcessPrivilege	4536	wmic.exe
Token: SeIncBasePriorityPrivilege	4536	wmic.exe
Token: SeCreatePagefilePrivilege	4536	wmic.exe
Token: SeBackupPrivilege	4536	wmic.exe
Token: SeRestorePrivilege	4536	wmic.exe
Token: SeShutdownPrivilege	4536	wmic.exe
Token: SeDebugPrivilege	4536	wmic.exe
Token: SeSystemEnvironmentPrivilege	4536	wmic.exe
Token: SeRemoteShutdownPrivilege	4536	wmic.exe
Token: SeUndockPrivilege	4536	wmic.exe
Token: SeManageVolumePrivilege	4536	wmic.exe
Token: 33	4536	wmic.exe
Token: 34	4536	wmic.exe
Token: 35	4536	wmic.exe
Token: 36	4536	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

RobloxPlayerLauncher.exe

description	pid	process	target process
PID 4320 wrote to memory of 4020	4320	RobloxPlayerLauncher.exe	attrib.exe
PID 4320 wrote to memory of 4020	4320	RobloxPlayerLauncher.exe	attrib.exe
PID 4320 wrote to memory of 1220	4320	RobloxPlayerLauncher.exe	attrib.exe
PID 4320 wrote to memory of 1220	4320	RobloxPlayerLauncher.exe	attrib.exe
PID 4320 wrote to memory of 4536	4320	RobloxPlayerLauncher.exe	wmic.exe
PID 4320 wrote to memory of 4536	4320	RobloxPlayerLauncher.exe	wmic.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

4020 attrib.exe
1220 attrib.exe

pid	process
4020	attrib.exe
1220	attrib.exe

C:\Users\Admin\AppData\Local\Temp\RobloxPlayerLauncher.exe
"C:\Users\Admin\AppData\Local\Temp\RobloxPlayerLauncher.exe"
1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4320
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\RobloxPlayerLauncher.exe
  2⤵
  - Views/modifies file attributes
  PID:4020
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1220
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4536

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Hide Artifacts

1

T1564

Hidden Files and Directories

Modify Registry

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe

Filesize
9.9MB

MD5
5c5df6c4b78bfb7d355e572b6cfce6d2

SHA1
830265d6a2765a753e9d9dee7b9a889aa025fb5b

SHA256
5c4c6ef3aed460f7ea15025bc160768e00c988747b943c99faf9f09b73f86e18

SHA512
ea058263672e14bd4c3730d471489a04f97ba697eb9fbae4ff5e6c735f3438c99720cbe3a308bd25d081006be54b0ac77c4f43839dd57abb6408e2f4781e7689

Download Submit

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads