skuld | dc23f531b2e23535601968a1453a45565c9214264d4ef3d016c0a983ed720c30

General

Target

EternalPredictor.exe
Size

17.6MB
MD5

7d207c243b33d6f3d78acadffd95ae0e
SHA1

a3ad8109c208b12d35359e78f4ebc23ed79ccf24
SHA256

dc23f531b2e23535601968a1453a45565c9214264d4ef3d016c0a983ed720c30
SHA512

ac9740408cd0dc7ff93835defed55af7359456eaa2cd092704e6f7ffe5fa3ea3b87d9ab927e4c06e96f9c030f8dc14cffe157ccf74618aa4ea9c33d875fca0fd
SSDEEP

393216:U8o6tLbdhAQdfxvzbjv1sIUO82oi61Mlk+kv4af0ADcOeIsP:UsbPJpvpn82oi6ulkPLf0WcOeR

Score

10^/10

skuld xworm persistence rat stealer trojan upx

Malware Config

Extracted

Family

xworm

C2

147.185.221.23:33942

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1298867906041479188/X0YmXSYYuFGsCIlZL1CQlv_GeIoIWc3S1cksX7_7_e4Onj-TjaVqNzNpf_yEZ3AJvNBM

Signatures

Detect Xworm Payload 3 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\eternal.exe	family_xworm
behavioral1/memory/2348-7-0x0000000000C70000-0x0000000000C88000-memory.dmp	family_xworm
behavioral1/memory/1956-80-0x0000000000F90000-0x0000000000FA8000-memory.dmp	family_xworm

Skuld family
skuld
Skuld stealer
An info stealer written in Go lang.
stealer skuld
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Drops startup file 2 IoCs

Processes:

eternal.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	eternal.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	eternal.exe

Executes dropped EXE 7 IoCs

Processes:

eternal.exeskuld.exeprogram.exeprogram.exeXClient.exeXClient.exe

pid process

2348 eternal.exe
2504 skuld.exe
2120 program.exe
2596 program.exe
1196
1956 XClient.exe
2276 XClient.exe
Loads dropped DLL 5 IoCs

Processes:

EternalPredictor.exeprogram.exe

pid process

2360 EternalPredictor.exe
2360 EternalPredictor.exe
2360 EternalPredictor.exe
2596 program.exe
1196

pid	process
2348	eternal.exe
2504	skuld.exe
2120	program.exe
2596	program.exe
1196
1956	XClient.exe
2276	XClient.exe

pid	process
2360	EternalPredictor.exe
2360	EternalPredictor.exe
2360	EternalPredictor.exe
2596	program.exe
1196

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

eternal.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1488793075-819845221-1497111674-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	eternal.exe

UPX packed file 2 IoCs

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

upx

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\_MEI21202\python313.dll	upx
behavioral1/memory/2596-47-0x000007FEF1CC0000-0x000007FEF2323000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exe

pid process

2744 schtasks.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

eternal.exe

pid process

2348 eternal.exe

pid	process
2744	schtasks.exe

pid	process
2348	eternal.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

eternal.exeXClient.exeXClient.exe

description	pid	process
Token: SeDebugPrivilege	2348	eternal.exe
Token: SeDebugPrivilege	2348	eternal.exe
Token: SeDebugPrivilege	1956	XClient.exe
Token: SeDebugPrivilege	2276	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

eternal.exe

pid process

2348 eternal.exe

pid	process
2348	eternal.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

EternalPredictor.exeprogram.exeeternal.exetaskeng.exe

description	pid	process	target process
PID 2360 wrote to memory of 2348	2360	EternalPredictor.exe	eternal.exe
PID 2360 wrote to memory of 2348	2360	EternalPredictor.exe	eternal.exe
PID 2360 wrote to memory of 2348	2360	EternalPredictor.exe	eternal.exe
PID 2360 wrote to memory of 2504	2360	EternalPredictor.exe	skuld.exe
PID 2360 wrote to memory of 2504	2360	EternalPredictor.exe	skuld.exe
PID 2360 wrote to memory of 2504	2360	EternalPredictor.exe	skuld.exe
PID 2360 wrote to memory of 2120	2360	EternalPredictor.exe	program.exe
PID 2360 wrote to memory of 2120	2360	EternalPredictor.exe	program.exe
PID 2360 wrote to memory of 2120	2360	EternalPredictor.exe	program.exe
PID 2120 wrote to memory of 2596	2120	program.exe	program.exe
PID 2120 wrote to memory of 2596	2120	program.exe	program.exe
PID 2120 wrote to memory of 2596	2120	program.exe	program.exe
PID 2348 wrote to memory of 2744	2348	eternal.exe	schtasks.exe
PID 2348 wrote to memory of 2744	2348	eternal.exe	schtasks.exe
PID 2348 wrote to memory of 2744	2348	eternal.exe	schtasks.exe
PID 2920 wrote to memory of 1956	2920	taskeng.exe	XClient.exe
PID 2920 wrote to memory of 1956	2920	taskeng.exe	XClient.exe
PID 2920 wrote to memory of 1956	2920	taskeng.exe	XClient.exe
PID 2920 wrote to memory of 2276	2920	taskeng.exe	XClient.exe
PID 2920 wrote to memory of 2276	2920	taskeng.exe	XClient.exe
PID 2920 wrote to memory of 2276	2920	taskeng.exe	XClient.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\EternalPredictor.exe
"C:\Users\Admin\AppData\Local\Temp\EternalPredictor.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2360
- C:\Users\Admin\AppData\Roaming\eternal.exe
  "C:\Users\Admin\AppData\Roaming\eternal.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2348
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Roaming\XClient.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2744
- C:\Users\Admin\AppData\Roaming\skuld.exe
  "C:\Users\Admin\AppData\Roaming\skuld.exe"
  2⤵
  - Executes dropped EXE
  PID:2504
- C:\Users\Admin\AppData\Roaming\program.exe
  "C:\Users\Admin\AppData\Roaming\program.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:2120
- - C:\Users\Admin\AppData\Roaming\program.exe
    "C:\Users\Admin\AppData\Roaming\program.exe"
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    PID:2596

C:\Windows\system32\taskeng.exe
taskeng.exe {D933DB3B-C2B4-485A-9F95-D24DEB5D2533} S-1-5-21-1488793075-819845221-1497111674-1000:UPNECVIU\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2920
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1956
- C:\Users\Admin\AppData\Roaming\XClient.exe
  C:\Users\Admin\AppData\Roaming\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2276

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\_MEI21202\python313.dll

Filesize
1.8MB

MD5
6ef5d2f77064df6f2f47af7ee4d44f0f

SHA1
0003946454b107874aa31839d41edcda1c77b0af

SHA256
ab7c640f044d2eb7f4f0a4dfe5e719dfd9e5fcd769943233f5cece436870e367

SHA512
1662cc02635d63b8114b41d11ec30a2af4b0b60209196aac937c2a608588fee47c6e93163ea6bf958246c32759ac5c82a712ea3d690e796e2070ac0ff9104266

Download Submit
C:\Users\Admin\AppData\Roaming\eternal.exe

Filesize
69KB

MD5
7439cc991a9a756c41153b8e9121baab

SHA1
c62528386e5f62ff2975cc8ed0cad3a7d362e632

SHA256
31a2b821e933bb193d94438d4a5aa036519535336c936d65b66889fb03164e2d

SHA512
cbdfd77671884407f8f4bd9c5251df5d8896b29bd004ea52460eda8a222df7492c69572e044376315624220f3ea66de3aff34323ea281591ca2975f90fa6dd51

Download Submit
\Users\Admin\AppData\Roaming\program.exe

Filesize
7.6MB

MD5
3e6865657b29faea3a355c710f0aad45

SHA1
ad9b98fa0f96685abc17aaab7fe4d65ac8fe34f7

SHA256
2c48f7bc874f1c812c0031519e756c28f940a58b2f64cdb40a08f1ccc798f671

SHA512
b360b5a244e83ee95719d7e781b9a49a29a5251e936619786b0151d0992aee33746109b3a8b0ab8d18c2788b738892c9b296c8c601025e16d850d730837b1615

Download Submit
\Users\Admin\AppData\Roaming\skuld.exe

Filesize
9.9MB

MD5
dbbd2127d1030e4c9548fdf7de9983a7

SHA1
5b7939a94cbd908ad8f57bb2e5328cce657c3700

SHA256
8e3601302c0294914808b6537cd27de961d087ba0807590b981b7f8c8aa5eee6

SHA512
95a1112c9b062745df9c20f566cfcb9421221111d02db0c1a940a5ea230b09c39a487685ae674c350e4641132e3360a19ca0cd8762f7e46cecde8b7dd85fe5d2

Download Submit
memory/1956-80-0x0000000000F90000-0x0000000000FA8000-memory.dmp

Filesize
96KB

Download
memory/2348-22-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-7-0x0000000000C70000-0x0000000000C88000-memory.dmp

Filesize
96KB

Download
memory/2348-54-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-75-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2348-76-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-0-0x000007FEF52A3000-0x000007FEF52A4000-memory.dmp

Filesize
4KB

Download
memory/2360-1-0x0000000000170000-0x0000000001306000-memory.dmp

Filesize
17.6MB

Download
memory/2596-47-0x000007FEF1CC0000-0x000007FEF2323000-memory.dmp

Filesize
6.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads