shurk | 08d215fd35494280e6397e8bc527bd6de64eb78a73acd3bd07a01da376ed4cb7

Resubmissions

07-02-2022 00:34

220207-aw81qsdce2 10

Analysis

max time kernel
145s
max time network
146s
platform
windows7_x64
resource
win7-en-20211208
submitted
07-02-2022 00:34

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General

Target

1fc2d.exe
Size

3.5MB
MD5

8f94297c9a87de5c84a3c6b2d43a3809
SHA1

611cb3591c6a428f01f82c08c4bea4972635445f
SHA256

e1eda5c9ef3158ecc5dabc82b244def26c0a938c797a1c97752ff32505b0f048
SHA512

033e87be95251798d567dc80d2582880126372668dc021bd008be439d73768b94340301e1ceee3ed2833f73cc35fafc5b522147ddd25a3b685508cd3c363e4a5

Score

10^/10

shurk infostealer spyware stealer

Malware Config

Signatures

Shurk
Shurk is an infostealer, written in C++ which appeared in 2021.
infostealer shurk

Shurk Stealer Payload 7 IoCs

resource	yara_rule
behavioral9/memory/1628-59-0x0000000000400000-0x0000000000470000-memory.dmp	shurk_stealer
behavioral9/memory/1628-60-0x0000000000400000-0x0000000000470000-memory.dmp	shurk_stealer
behavioral9/memory/1628-61-0x0000000000400000-0x0000000000470000-memory.dmp	shurk_stealer
behavioral9/memory/1628-62-0x0000000000400000-0x0000000000470000-memory.dmp	shurk_stealer
behavioral9/memory/1628-63-0x0000000000400000-0x0000000000470000-memory.dmp	shurk_stealer
behavioral9/memory/1628-64-0x0000000000400000-0x00000000005B0000-memory.dmp	shurk_stealer
behavioral9/memory/1628-65-0x0000000000400000-0x00000000005B0000-memory.dmp	shurk_stealer

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Suspicious use of NtSetInformationThreadHideFromDebugger 8 IoCs

pid	Process
2016	1fc2d.exe
2016	1fc2d.exe
2016	1fc2d.exe
2016	1fc2d.exe
2016	1fc2d.exe
2016	1fc2d.exe
2016	1fc2d.exe
2016	1fc2d.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2016 set thread context of 1628	2016	1fc2d.exe	30

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
588	2016	WerFault.exe	26

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
628	timeout.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2016	1fc2d.exe
2016	1fc2d.exe
1628	1fc2d.exe
588	WerFault.exe
588	WerFault.exe
588	WerFault.exe
588	WerFault.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
588	WerFault.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2016	1fc2d.exe
Token: SeDebugPrivilege	588	WerFault.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2016 wrote to memory of 1724	2016	1fc2d.exe	27
PID 2016 wrote to memory of 1724	2016	1fc2d.exe	27
PID 2016 wrote to memory of 1724	2016	1fc2d.exe	27
PID 2016 wrote to memory of 1724	2016	1fc2d.exe	27
PID 1724 wrote to memory of 628	1724	cmd.exe	29
PID 1724 wrote to memory of 628	1724	cmd.exe	29
PID 1724 wrote to memory of 628	1724	cmd.exe	29
PID 1724 wrote to memory of 628	1724	cmd.exe	29
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 1628	2016	1fc2d.exe	30
PID 2016 wrote to memory of 588	2016	1fc2d.exe	31
PID 2016 wrote to memory of 588	2016	1fc2d.exe	31
PID 2016 wrote to memory of 588	2016	1fc2d.exe	31
PID 2016 wrote to memory of 588	2016	1fc2d.exe	31

C:\Users\Admin\AppData\Local\Temp\1fc2d.exe
"C:\Users\Admin\AppData\Local\Temp\1fc2d.exe"
1⤵
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2016
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout 1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1724
- - C:\Windows\SysWOW64\timeout.exe
    timeout 1
    3⤵
    - Delays execution with timeout.exe
    PID:628
- C:\Users\Admin\AppData\Local\Temp\1fc2d.exe
  "C:\Users\Admin\AppData\Local\Temp\1fc2d.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1628
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2016 -s 872
  2⤵
  - Program crash
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:588

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/588-66-0x00000000751B1000-0x00000000751B3000-memory.dmp

Filesize
8KB

Download
memory/588-67-0x0000000000300000-0x0000000000301000-memory.dmp

Filesize
4KB

Download
memory/1628-58-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-57-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-59-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-60-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-61-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-62-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-63-0x0000000000400000-0x0000000000470000-memory.dmp

Filesize
448KB

Download
memory/1628-64-0x0000000000400000-0x00000000005B0000-memory.dmp

Filesize
1.7MB

Download
memory/1628-65-0x0000000000400000-0x00000000005B0000-memory.dmp

Filesize
1.7MB

Download
memory/2016-54-0x0000000000D90000-0x0000000001110000-memory.dmp

Filesize
3.5MB

Download
memory/2016-56-0x00000000008F0000-0x0000000000972000-memory.dmp

Filesize
520KB

Download
memory/2016-55-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

Filesize
4KB

Download