shurk | 5d664949d5e1ec3b32f6158556ba036bc72d4f62ce94ac214d53dd434287180b

Analysis

max time kernel
137s
max time network
266s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
11-08-2023 02:28

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General

Target

Launcher.exe
Size

11.5MB
MD5

525eca0e85c3325eca5b5b3cfeacd241
SHA1

809ff78b0c5a587672f993c6a15c98bdd36141c3
SHA256

9f77929368d4760cdf6a905141622bce67b5c2e13f14b2e12ac8b658108ccdbb
SHA512

c815f1393d61e4743317cbbaa2aec8d917e0cc20990b5afa8a5960db703bbbbb1c257d0322d301f15f933cb7a9bf07d7de927663a34420ff892a81ca3227c320
SSDEEP

49152:+qRnLGu+sHczMYNYEBBMaS3H5KCKsntU6ZKC9sBcRLr1+ar9SgVfB1LlGrGOjk1s:sug

Score

10^/10

shurk infostealer persistence spyware stealer

Malware Config

Signatures

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

Shurk Stealer payload 2 IoCs

resource	yara_rule
behavioral2/memory/3596-137-0x00007FF430F70000-0x00007FF4317B8000-memory.dmp	shurk_stealer
behavioral2/memory/3596-138-0x000001B2F94B0000-0x000001B2F9C8F000-memory.dmp	shurk_stealer

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
452	winhoster.exe

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
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001

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-1-5-21-1498570331-2313266200-788959944-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WinHoster = "C:\\Users\\Admin\\AppData\\Roaming\\WinHoster\\winhoster.exe"	winhoster.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	checkip.amazonaws.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2384	WMIC.exe

GoLang User-Agent 4 IoCs

Uses default user-agent string defined by GoLang HTTP packages.

description	flow	ioc
HTTP User-Agent header	2	Go-http-client/1.1
HTTP User-Agent header	7	Go-http-client/1.1
HTTP User-Agent header	11	Go-http-client/1.1
HTTP User-Agent header	20	Go-http-client/1.1

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3600	powershell.exe
3600	powershell.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2384	WMIC.exe
Token: SeSecurityPrivilege	2384	WMIC.exe
Token: SeTakeOwnershipPrivilege	2384	WMIC.exe
Token: SeLoadDriverPrivilege	2384	WMIC.exe
Token: SeSystemProfilePrivilege	2384	WMIC.exe
Token: SeSystemtimePrivilege	2384	WMIC.exe
Token: SeProfSingleProcessPrivilege	2384	WMIC.exe
Token: SeIncBasePriorityPrivilege	2384	WMIC.exe
Token: SeCreatePagefilePrivilege	2384	WMIC.exe
Token: SeBackupPrivilege	2384	WMIC.exe
Token: SeRestorePrivilege	2384	WMIC.exe
Token: SeShutdownPrivilege	2384	WMIC.exe
Token: SeDebugPrivilege	2384	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2384	WMIC.exe
Token: SeRemoteShutdownPrivilege	2384	WMIC.exe
Token: SeUndockPrivilege	2384	WMIC.exe
Token: SeManageVolumePrivilege	2384	WMIC.exe
Token: 33	2384	WMIC.exe
Token: 34	2384	WMIC.exe
Token: 35	2384	WMIC.exe
Token: 36	2384	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2384	WMIC.exe
Token: SeSecurityPrivilege	2384	WMIC.exe
Token: SeTakeOwnershipPrivilege	2384	WMIC.exe
Token: SeLoadDriverPrivilege	2384	WMIC.exe
Token: SeSystemProfilePrivilege	2384	WMIC.exe
Token: SeSystemtimePrivilege	2384	WMIC.exe
Token: SeProfSingleProcessPrivilege	2384	WMIC.exe
Token: SeIncBasePriorityPrivilege	2384	WMIC.exe
Token: SeCreatePagefilePrivilege	2384	WMIC.exe
Token: SeBackupPrivilege	2384	WMIC.exe
Token: SeRestorePrivilege	2384	WMIC.exe
Token: SeShutdownPrivilege	2384	WMIC.exe
Token: SeDebugPrivilege	2384	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2384	WMIC.exe
Token: SeRemoteShutdownPrivilege	2384	WMIC.exe
Token: SeUndockPrivilege	2384	WMIC.exe
Token: SeManageVolumePrivilege	2384	WMIC.exe
Token: 33	2384	WMIC.exe
Token: 34	2384	WMIC.exe
Token: 35	2384	WMIC.exe
Token: 36	2384	WMIC.exe
Token: SeDebugPrivilege	3600	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3596 wrote to memory of 4356	3596	Launcher.exe	81
PID 3596 wrote to memory of 4356	3596	Launcher.exe	81
PID 4356 wrote to memory of 2384	4356	cmd.exe	83
PID 4356 wrote to memory of 2384	4356	cmd.exe	83
PID 3596 wrote to memory of 3600	3596	Launcher.exe	84
PID 3596 wrote to memory of 3600	3596	Launcher.exe	84
PID 3596 wrote to memory of 452	3596	Launcher.exe	87
PID 3596 wrote to memory of 452	3596	Launcher.exe	87
PID 3596 wrote to memory of 452	3596	Launcher.exe	87

C:\Users\Admin\AppData\Local\Temp\Launcher.exe
"C:\Users\Admin\AppData\Local\Temp\Launcher.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3596
- C:\Windows\system32\cmd.exe
  cmd /C "wmic path win32_VideoController get name"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4356
- - C:\Windows\System32\Wbem\WMIC.exe
    wmic path win32_VideoController get name
    3⤵
    - Detects videocard installed
    - Suspicious use of AdjustPrivilegeToken
    PID:2384
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -WindowStyle Hidden -Command Add-MpPreference -ExclusionPath C:\Users\Admin\AppData\Roaming/WinHoster
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3600
- C:\Users\Admin\AppData\Roaming\WinHoster\winhoster.exe
  C:\Users\Admin\AppData\Roaming/WinHoster/winhoster.exe
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  PID:452

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

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

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

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nov3a4dz.iuo.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\WinHoster\winhoster.exe

Filesize
185KB

MD5
39a3b5a48178b860ba3c69dfa191e974

SHA1
83b1a7f8851aa095b00705c6876ff33419618b80

SHA256
0b8e662e7e595ef56396a298c367b74721d66591d856e8a8241fcdd60d08373c

SHA512
a131c0866e5afd53ed53cd3b825c1a4b304547283923a33cc722984b147156db0e21c3df1142a353227260dac32cb2e7f136d1a9d93315cc9aa3673bf8602605

Download Submit
C:\Users\Admin\AppData\Roaming\WinHoster\winhoster.exe

Filesize
185KB

MD5
39a3b5a48178b860ba3c69dfa191e974

SHA1
83b1a7f8851aa095b00705c6876ff33419618b80

SHA256
0b8e662e7e595ef56396a298c367b74721d66591d856e8a8241fcdd60d08373c

SHA512
a131c0866e5afd53ed53cd3b825c1a4b304547283923a33cc722984b147156db0e21c3df1142a353227260dac32cb2e7f136d1a9d93315cc9aa3673bf8602605

Download Submit
memory/3596-137-0x00007FF430F70000-0x00007FF4317B8000-memory.dmp

Filesize
8.3MB

Download
memory/3596-138-0x000001B2F94B0000-0x000001B2F9C8F000-memory.dmp

Filesize
7.9MB

Download
memory/3596-178-0x000001B2F94B0000-0x000001B2F9C8F000-memory.dmp

Filesize
7.9MB

Download
memory/3596-136-0x000001B2F94B0000-0x000001B2F9C8F000-memory.dmp

Filesize
7.9MB

Download
memory/3600-167-0x0000015C74160000-0x0000015C74170000-memory.dmp

Filesize
64KB

Download
memory/3600-169-0x0000015C74160000-0x0000015C74170000-memory.dmp

Filesize
64KB

Download
memory/3600-170-0x0000015C74160000-0x0000015C74170000-memory.dmp

Filesize
64KB

Download
memory/3600-173-0x00007FFA57970000-0x00007FFA58431000-memory.dmp

Filesize
10.8MB

Download
memory/3600-168-0x0000015C74160000-0x0000015C74170000-memory.dmp

Filesize
64KB

Download
memory/3600-166-0x00007FFA57970000-0x00007FFA58431000-memory.dmp

Filesize
10.8MB

Download
memory/3600-156-0x0000015C740A0000-0x0000015C740C2000-memory.dmp

Filesize
136KB

Download