shurk | 108dd8675ad26778748b563a1f590fef6f9875d484002e3d48adb7268358263d

Analysis

max time kernel
142s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
10-08-2023 16:42

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General

Target

78bc9c35531a7e1a31af3bdff4083df6.exe
Size

7.7MB
MD5

78bc9c35531a7e1a31af3bdff4083df6
SHA1

a679051cff10c802a126c25c42f12fefac857a31
SHA256

108dd8675ad26778748b563a1f590fef6f9875d484002e3d48adb7268358263d
SHA512

2a41f758b0da999e3d2afbe4c7f0f5b4d675dc643f866d4947b9570c9b8ccd6bc3ebf44a67c82633ae9992404c1e9a9ba0956712a451446a9e8ddd6fcc1ef526
SSDEEP

196608:SdrOnwUbN9pdNqVWEwLnN+HDc/Up7sSpoVmPYYfW/:SVRUb5dN65ON+AMWS6VmlW/

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 1 IoCs

resource	yara_rule
behavioral2/memory/980-135-0x00007FF492A00000-0x00007FF4931E3000-memory.dmp	shurk_stealer

Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
2932	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-1-5-21-3011986978-2180659500-3669311805-1000\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
7	checkip.amazonaws.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4692	WMIC.exe

GoLang User-Agent 4 IoCs

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

description	flow	ioc
HTTP User-Agent header	8	Go-http-client/1.1
HTTP User-Agent header	10	Go-http-client/1.1
HTTP User-Agent header	16	Go-http-client/1.1
HTTP User-Agent header	22	Go-http-client/1.1

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
880	powershell.exe
880	powershell.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	4692	WMIC.exe
Token: SeSecurityPrivilege	4692	WMIC.exe
Token: SeTakeOwnershipPrivilege	4692	WMIC.exe
Token: SeLoadDriverPrivilege	4692	WMIC.exe
Token: SeSystemProfilePrivilege	4692	WMIC.exe
Token: SeSystemtimePrivilege	4692	WMIC.exe
Token: SeProfSingleProcessPrivilege	4692	WMIC.exe
Token: SeIncBasePriorityPrivilege	4692	WMIC.exe
Token: SeCreatePagefilePrivilege	4692	WMIC.exe
Token: SeBackupPrivilege	4692	WMIC.exe
Token: SeRestorePrivilege	4692	WMIC.exe
Token: SeShutdownPrivilege	4692	WMIC.exe
Token: SeDebugPrivilege	4692	WMIC.exe
Token: SeSystemEnvironmentPrivilege	4692	WMIC.exe
Token: SeRemoteShutdownPrivilege	4692	WMIC.exe
Token: SeUndockPrivilege	4692	WMIC.exe
Token: SeManageVolumePrivilege	4692	WMIC.exe
Token: 33	4692	WMIC.exe
Token: 34	4692	WMIC.exe
Token: 35	4692	WMIC.exe
Token: 36	4692	WMIC.exe
Token: SeIncreaseQuotaPrivilege	4692	WMIC.exe
Token: SeSecurityPrivilege	4692	WMIC.exe
Token: SeTakeOwnershipPrivilege	4692	WMIC.exe
Token: SeLoadDriverPrivilege	4692	WMIC.exe
Token: SeSystemProfilePrivilege	4692	WMIC.exe
Token: SeSystemtimePrivilege	4692	WMIC.exe
Token: SeProfSingleProcessPrivilege	4692	WMIC.exe
Token: SeIncBasePriorityPrivilege	4692	WMIC.exe
Token: SeCreatePagefilePrivilege	4692	WMIC.exe
Token: SeBackupPrivilege	4692	WMIC.exe
Token: SeRestorePrivilege	4692	WMIC.exe
Token: SeShutdownPrivilege	4692	WMIC.exe
Token: SeDebugPrivilege	4692	WMIC.exe
Token: SeSystemEnvironmentPrivilege	4692	WMIC.exe
Token: SeRemoteShutdownPrivilege	4692	WMIC.exe
Token: SeUndockPrivilege	4692	WMIC.exe
Token: SeManageVolumePrivilege	4692	WMIC.exe
Token: 33	4692	WMIC.exe
Token: 34	4692	WMIC.exe
Token: 35	4692	WMIC.exe
Token: 36	4692	WMIC.exe
Token: SeDebugPrivilege	880	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 980 wrote to memory of 2480	980	78bc9c35531a7e1a31af3bdff4083df6.exe	82
PID 980 wrote to memory of 2480	980	78bc9c35531a7e1a31af3bdff4083df6.exe	82
PID 2480 wrote to memory of 4692	2480	cmd.exe	85
PID 2480 wrote to memory of 4692	2480	cmd.exe	85
PID 980 wrote to memory of 880	980	78bc9c35531a7e1a31af3bdff4083df6.exe	86
PID 980 wrote to memory of 880	980	78bc9c35531a7e1a31af3bdff4083df6.exe	86
PID 980 wrote to memory of 2932	980	78bc9c35531a7e1a31af3bdff4083df6.exe	90
PID 980 wrote to memory of 2932	980	78bc9c35531a7e1a31af3bdff4083df6.exe	90
PID 980 wrote to memory of 2932	980	78bc9c35531a7e1a31af3bdff4083df6.exe	90

C:\Users\Admin\AppData\Local\Temp\78bc9c35531a7e1a31af3bdff4083df6.exe
"C:\Users\Admin\AppData\Local\Temp\78bc9c35531a7e1a31af3bdff4083df6.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:980
- C:\Windows\system32\cmd.exe
  cmd /C "wmic path win32_VideoController get name"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2480
- - C:\Windows\System32\Wbem\WMIC.exe
    wmic path win32_VideoController get name
    3⤵
    - Detects videocard installed
    - Suspicious use of AdjustPrivilegeToken
    PID:4692
- 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:880
- 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:2932

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_0yhvmecs.xcu.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/880-153-0x0000018BC5050000-0x0000018BC5072000-memory.dmp

Filesize
136KB

Download
memory/880-163-0x00007FFACC0F0000-0x00007FFACCBB1000-memory.dmp

Filesize
10.8MB

Download
memory/880-165-0x0000018BC5080000-0x0000018BC5090000-memory.dmp

Filesize
64KB

Download
memory/880-164-0x0000018BC5080000-0x0000018BC5090000-memory.dmp

Filesize
64KB

Download
memory/880-168-0x00007FFACC0F0000-0x00007FFACCBB1000-memory.dmp

Filesize
10.8MB

Download
memory/980-133-0x000002133EB80000-0x000002133F2FA000-memory.dmp

Filesize
7.5MB

Download
memory/980-135-0x00007FF492A00000-0x00007FF4931E3000-memory.dmp

Filesize
7.9MB

Download
memory/980-173-0x00000000005E0000-0x0000000000D9C000-memory.dmp

Filesize
7.7MB

Download
memory/980-134-0x000002133EB80000-0x000002133F2FA000-memory.dmp

Filesize
7.5MB

Download
memory/980-175-0x000002133EB80000-0x000002133F2FA000-memory.dmp

Filesize
7.5MB

Download