skuld | 1039ecbae09ab86703af4ddaef7e9cab739b75d1adb0879914389cee7683bd6f

General

Target

scrim mod.exe
Size

3.2MB
MD5

8b18c1414d646cd4138db5c1b67c318a
SHA1

58642571e177880cd319d2b6777ea4350845a199
SHA256

1039ecbae09ab86703af4ddaef7e9cab739b75d1adb0879914389cee7683bd6f
SHA512

8f273ecf086f3e21adccb8581ef0e047d1594ae6c7344a004bc1454497edc33a5b51fa7085e31808293ac5a8e210a3a158fa755d930b2057d9dd078bb35ede16
SSDEEP

98304:WfzzQtNrIU8czmxnPCObnlItD60EiBmW/avuhF:iQNCxnPpJItD6Zi8uX

Score

10^/10

skuld persistence stealer upx

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1279918414151811084/vVYCMnXox3dM_lOJkaNDChap2gbQftEjcKl4GdYEPumAxFJEA7KYNeqYd_tgvv_dcIvH

Signatures

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

UPX packed file 3 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/3532-0-0x00000000008B0000-0x00000000012F8000-memory.dmp	upx
C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe	upx
behavioral1/memory/3532-5-0x00000000008B0000-0x00000000012F8000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

scrim mod.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1287768749-810021449-2672985988-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	scrim mod.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

2 api.ipify.org
1 api.ipify.org
1 ip-api.com

flow	ioc
2	api.ipify.org
1	api.ipify.org
1	ip-api.com

Maps connected drives based on registry 3 TTPs 2 IoCs

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

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

scrim mod.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	scrim mod.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	scrim mod.exe

Detects videocard installed 1 TTPs 1 IoCs
Uses WMIC.exe to determine videocard installed.

System Information Discovery
T1082

Processes:

wmic.exe

pid process

3364 wmic.exe
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.

Processes:

description flow ioc

HTTP User-Agent header 3 Go-http-client/1.1

pid	process
3364	wmic.exe

description	flow	ioc
HTTP User-Agent header	3	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:

scrim mod.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C	scrim mod.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 0400000001000000100000003e455215095192e1b75d379fb187298a0f00000001000000140000005a6d07b6371d966a2fb6ba92828ce5512a49513d090000000100000068000000306606082b0601050507030206082b06010505070303060a2b0601040182370a030406082b0601050507030406082b0601050508020206082b0601050507030606082b0601050507030706082b0601050507030906082b0601050507030106082b06010505070308530000000100000040000000303e301f06092b06010401a032010130123010060a2b0601040182373c0101030200c0301b060567810c010330123010060a2b0601040182373c0101030200c00b000000010000003000000047006c006f00620061006c005300690067006e00200052006f006f00740020004300410020002d002000520031000000620000000100000020000000ebd41040e4bb3ec742c9e381d31ef2a41a48b6685c96e7cef3c1df6cd4331c99140000000100000014000000607b661a450d97ca89502f7d04cd34a8fffcfd4b1d00000001000000100000006ee7f3b060d10e90a31ba3471b9992367f000000010000000c000000300a06082b060105050703097a000000010000000c000000300a06082b060105050703097e00000001000000080000000000042beb77d501030000000100000014000000b1bc968bd4f49d622aa89a81f2150152a41d829c190000000100000010000000a823b4a20180beb460cab955c24d7e21200000000100000079030000308203753082025da003020102020b040000000001154b5ac394300d06092a864886f70d01010505003057310b300906035504061302424531193017060355040a1310476c6f62616c5369676e206e762d73613110300e060355040b1307526f6f74204341311b301906035504031312476c6f62616c5369676e20526f6f74204341301e170d3938303930313132303030305a170d3238303132383132303030305a3057310b300906035504061302424531193017060355040a1310476c6f62616c5369676e206e762d73613110300e060355040b1307526f6f74204341311b301906035504031312476c6f62616c5369676e20526f6f7420434130820122300d06092a864886f70d01010105000382010f003082010a0282010100da0ee6998dcea3e34f8a7efbf18b83256bea481ff12ab0b9951104bdf063d1e26766cf1cddcf1b482bee8d898e9aaf298065abe9c72d12cbab1c4c7007a13d0a30cd158d4ff8ddd48c50151cef50eec42ef7fce952f2917de06dd535308e5e4373f241e9d56ae3b2893a5639386f063c88695b2a4dc5a754b86c89cc9bf93ccae5fd89f5123c927896d6dc746e934461d18dc746b2750e86e8198ad56d6cd5781695a2e9c80a38ebf224134f73549313853a1bbc1e34b58b058cb9778bb1db1f2091ab09536e90ce7b3774b97047912251631679aeb1ae412608c8192bd146aa48d6642ad78334ff2c2ac16c19434a0785e7d37cf62168efeaf2529f7f9390cf0203010001a3423040300e0603551d0f0101ff040403020106300f0603551d130101ff040530030101ff301d0603551d0e04160414607b661a450d97ca89502f7d04cd34a8fffcfd4b300d06092a864886f70d01010505000382010100d673e77c4f76d08dbfecbaa2be34c52832b57cfc6c9c2c2bbd099e53bf6b5eaa1148b6e508a3b3ca3d614dd34609b33ec3a0e363551bf2baefad39e143b938a3e62f8a263befa05056f9c60afd38cdc40b705194979804dfc35f94d515c914419cc45d7564150dff5530ec868fff0def2cb96346f6aafcdfbc69fd2e1248649ae095f0a6ef298f01b115b50c1da5fe692c6924781eb3a71c7162eecac897ac175d8ac2f847866e2ac4563195d06789852bf96ca65d469d0caa82e49951dd70b7db563d61e46ae15cd6f6fe3dde41cc07ae6352bf5353f42be9c7fdb6f7825f85d24118db81b3041cc51fa4806f1520c9de0c880a1dd66655e2fc48c9292669e0	scrim mod.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	scrim mod.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

scrim mod.exewmic.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	3532	scrim mod.exe
Token: SeIncreaseQuotaPrivilege	4724	wmic.exe
Token: SeSecurityPrivilege	4724	wmic.exe
Token: SeTakeOwnershipPrivilege	4724	wmic.exe
Token: SeLoadDriverPrivilege	4724	wmic.exe
Token: SeSystemProfilePrivilege	4724	wmic.exe
Token: SeSystemtimePrivilege	4724	wmic.exe
Token: SeProfSingleProcessPrivilege	4724	wmic.exe
Token: SeIncBasePriorityPrivilege	4724	wmic.exe
Token: SeCreatePagefilePrivilege	4724	wmic.exe
Token: SeBackupPrivilege	4724	wmic.exe
Token: SeRestorePrivilege	4724	wmic.exe
Token: SeShutdownPrivilege	4724	wmic.exe
Token: SeDebugPrivilege	4724	wmic.exe
Token: SeSystemEnvironmentPrivilege	4724	wmic.exe
Token: SeRemoteShutdownPrivilege	4724	wmic.exe
Token: SeUndockPrivilege	4724	wmic.exe
Token: SeManageVolumePrivilege	4724	wmic.exe
Token: 33	4724	wmic.exe
Token: 34	4724	wmic.exe
Token: 35	4724	wmic.exe
Token: 36	4724	wmic.exe
Token: SeIncreaseQuotaPrivilege	4724	wmic.exe
Token: SeSecurityPrivilege	4724	wmic.exe
Token: SeTakeOwnershipPrivilege	4724	wmic.exe
Token: SeLoadDriverPrivilege	4724	wmic.exe
Token: SeSystemProfilePrivilege	4724	wmic.exe
Token: SeSystemtimePrivilege	4724	wmic.exe
Token: SeProfSingleProcessPrivilege	4724	wmic.exe
Token: SeIncBasePriorityPrivilege	4724	wmic.exe
Token: SeCreatePagefilePrivilege	4724	wmic.exe
Token: SeBackupPrivilege	4724	wmic.exe
Token: SeRestorePrivilege	4724	wmic.exe
Token: SeShutdownPrivilege	4724	wmic.exe
Token: SeDebugPrivilege	4724	wmic.exe
Token: SeSystemEnvironmentPrivilege	4724	wmic.exe
Token: SeRemoteShutdownPrivilege	4724	wmic.exe
Token: SeUndockPrivilege	4724	wmic.exe
Token: SeManageVolumePrivilege	4724	wmic.exe
Token: 33	4724	wmic.exe
Token: 34	4724	wmic.exe
Token: 35	4724	wmic.exe
Token: 36	4724	wmic.exe
Token: SeIncreaseQuotaPrivilege	3364	wmic.exe
Token: SeSecurityPrivilege	3364	wmic.exe
Token: SeTakeOwnershipPrivilege	3364	wmic.exe
Token: SeLoadDriverPrivilege	3364	wmic.exe
Token: SeSystemProfilePrivilege	3364	wmic.exe
Token: SeSystemtimePrivilege	3364	wmic.exe
Token: SeProfSingleProcessPrivilege	3364	wmic.exe
Token: SeIncBasePriorityPrivilege	3364	wmic.exe
Token: SeCreatePagefilePrivilege	3364	wmic.exe
Token: SeBackupPrivilege	3364	wmic.exe
Token: SeRestorePrivilege	3364	wmic.exe
Token: SeShutdownPrivilege	3364	wmic.exe
Token: SeDebugPrivilege	3364	wmic.exe
Token: SeSystemEnvironmentPrivilege	3364	wmic.exe
Token: SeRemoteShutdownPrivilege	3364	wmic.exe
Token: SeUndockPrivilege	3364	wmic.exe
Token: SeManageVolumePrivilege	3364	wmic.exe
Token: 33	3364	wmic.exe
Token: 34	3364	wmic.exe
Token: 35	3364	wmic.exe
Token: 36	3364	wmic.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

scrim mod.exe

description	pid	process	target process
PID 3532 wrote to memory of 4272	3532	scrim mod.exe	attrib.exe
PID 3532 wrote to memory of 4272	3532	scrim mod.exe	attrib.exe
PID 3532 wrote to memory of 5012	3532	scrim mod.exe	attrib.exe
PID 3532 wrote to memory of 5012	3532	scrim mod.exe	attrib.exe
PID 3532 wrote to memory of 4724	3532	scrim mod.exe	wmic.exe
PID 3532 wrote to memory of 4724	3532	scrim mod.exe	wmic.exe
PID 3532 wrote to memory of 3364	3532	scrim mod.exe	wmic.exe
PID 3532 wrote to memory of 3364	3532	scrim mod.exe	wmic.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

4272 attrib.exe
5012 attrib.exe

pid	process
4272	attrib.exe
5012	attrib.exe

C:\Users\Admin\AppData\Local\Temp\scrim mod.exe
"C:\Users\Admin\AppData\Local\Temp\scrim mod.exe"
1⤵
- Adds Run key to start application
- Maps connected drives based on registry
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3532
- C:\Windows\system32\attrib.exe
  attrib +h +s "C:\Users\Admin\AppData\Local\Temp\scrim mod.exe"
  2⤵
  - Views/modifies file attributes
  PID:4272
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:5012
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4724
- C:\Windows\System32\Wbem\wmic.exe
  wmic path win32_VideoController get name
  2⤵
  - Detects videocard installed
  - Suspicious use of AdjustPrivilegeToken
  PID:3364

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

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.2MB

MD5
8b18c1414d646cd4138db5c1b67c318a

SHA1
58642571e177880cd319d2b6777ea4350845a199

SHA256
1039ecbae09ab86703af4ddaef7e9cab739b75d1adb0879914389cee7683bd6f

SHA512
8f273ecf086f3e21adccb8581ef0e047d1594ae6c7344a004bc1454497edc33a5b51fa7085e31808293ac5a8e210a3a158fa755d930b2057d9dd078bb35ede16

Download Submit
memory/3532-0-0x00000000008B0000-0x00000000012F8000-memory.dmp

Filesize
10.3MB

Download
memory/3532-5-0x00000000008B0000-0x00000000012F8000-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