shurk | 9de0dfcf9baf669811374d2f6ed0a1182df8d0254cd210f6f2883c659014de5a

Resubmissions

11-07-2023 15:07

230711-shb3yshf25 10

11-07-2023 05:05

230711-fqw2waed46 10

Analysis

max time kernel
142s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
11-07-2023 05:05

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General

Target

Setup.exe
Size

7.0MB
MD5

7a7728a6ed63717026afc70d90780d54
SHA1

85861b46514cdb3fb55413af2f095455ff216747
SHA256

9de0dfcf9baf669811374d2f6ed0a1182df8d0254cd210f6f2883c659014de5a
SHA512

d9f877cf6e9f021069fd8e4d4623a944eb6bee34efa564cb64dfb3cdac9b756728c56e5b430e3f89606a49672917c503b19268d20594b95d3e15f1c244a39b43
SSDEEP

98304:ZLALpP1WbQ5/HChxfi0kMmJ6BxLk61BFO7FyAAC053zfVjOTHif:ZLA1SQ5/HSxfi0bBOubvCY8TC

Score

10^/10

shurk infostealer spyware stealer upx

Malware Config

Signatures

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

Shurk Stealer payload 3 IoCs

resource	yara_rule
behavioral3/memory/1300-134-0x0000000000400000-0x0000000000C71000-memory.dmp	shurk_stealer
behavioral3/memory/1300-148-0x0000000000400000-0x0000000000C71000-memory.dmp	shurk_stealer
behavioral3/memory/1300-149-0x0000000000400000-0x0000000000C71000-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

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral3/memory/1300-134-0x0000000000400000-0x0000000000C71000-memory.dmp	upx
behavioral3/memory/1300-148-0x0000000000400000-0x0000000000C71000-memory.dmp	upx
behavioral3/memory/1300-149-0x0000000000400000-0x0000000000C71000-memory.dmp	upx

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

Data from Local System
T1005

Credentials in Files
T1081

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
4	checkip.amazonaws.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3632	WMIC.exe

GoLang User-Agent 3 IoCs

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

description	flow	ioc
HTTP User-Agent header	6	Go-http-client/1.1
HTTP User-Agent header	9	Go-http-client/1.1
HTTP User-Agent header	12	Go-http-client/1.1

Suspicious use of AdjustPrivilegeToken 42 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3632	WMIC.exe
Token: SeSecurityPrivilege	3632	WMIC.exe
Token: SeTakeOwnershipPrivilege	3632	WMIC.exe
Token: SeLoadDriverPrivilege	3632	WMIC.exe
Token: SeSystemProfilePrivilege	3632	WMIC.exe
Token: SeSystemtimePrivilege	3632	WMIC.exe
Token: SeProfSingleProcessPrivilege	3632	WMIC.exe
Token: SeIncBasePriorityPrivilege	3632	WMIC.exe
Token: SeCreatePagefilePrivilege	3632	WMIC.exe
Token: SeBackupPrivilege	3632	WMIC.exe
Token: SeRestorePrivilege	3632	WMIC.exe
Token: SeShutdownPrivilege	3632	WMIC.exe
Token: SeDebugPrivilege	3632	WMIC.exe
Token: SeSystemEnvironmentPrivilege	3632	WMIC.exe
Token: SeRemoteShutdownPrivilege	3632	WMIC.exe
Token: SeUndockPrivilege	3632	WMIC.exe
Token: SeManageVolumePrivilege	3632	WMIC.exe
Token: 33	3632	WMIC.exe
Token: 34	3632	WMIC.exe
Token: 35	3632	WMIC.exe
Token: 36	3632	WMIC.exe
Token: SeIncreaseQuotaPrivilege	3632	WMIC.exe
Token: SeSecurityPrivilege	3632	WMIC.exe
Token: SeTakeOwnershipPrivilege	3632	WMIC.exe
Token: SeLoadDriverPrivilege	3632	WMIC.exe
Token: SeSystemProfilePrivilege	3632	WMIC.exe
Token: SeSystemtimePrivilege	3632	WMIC.exe
Token: SeProfSingleProcessPrivilege	3632	WMIC.exe
Token: SeIncBasePriorityPrivilege	3632	WMIC.exe
Token: SeCreatePagefilePrivilege	3632	WMIC.exe
Token: SeBackupPrivilege	3632	WMIC.exe
Token: SeRestorePrivilege	3632	WMIC.exe
Token: SeShutdownPrivilege	3632	WMIC.exe
Token: SeDebugPrivilege	3632	WMIC.exe
Token: SeSystemEnvironmentPrivilege	3632	WMIC.exe
Token: SeRemoteShutdownPrivilege	3632	WMIC.exe
Token: SeUndockPrivilege	3632	WMIC.exe
Token: SeManageVolumePrivilege	3632	WMIC.exe
Token: 33	3632	WMIC.exe
Token: 34	3632	WMIC.exe
Token: 35	3632	WMIC.exe
Token: 36	3632	WMIC.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1300 wrote to memory of 4472	1300	Setup.exe	88
PID 1300 wrote to memory of 4472	1300	Setup.exe	88
PID 4472 wrote to memory of 3632	4472	cmd.exe	89
PID 4472 wrote to memory of 3632	4472	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\Setup.exe
"C:\Users\Admin\AppData\Local\Temp\Setup.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1300
- C:\Windows\system32\cmd.exe
  cmd /C "wmic path win32_VideoController get name"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4472
- - C:\Windows\System32\Wbem\WMIC.exe
    wmic path win32_VideoController get name
    3⤵
    - Detects videocard installed
    - Suspicious use of AdjustPrivilegeToken
    PID:3632

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/1300-133-0x000002C3E6730000-0x000002C3E6DFA000-memory.dmp

Filesize
6.8MB

Download
memory/1300-134-0x0000000000400000-0x0000000000C71000-memory.dmp

Filesize
8.4MB

Download
memory/1300-148-0x0000000000400000-0x0000000000C71000-memory.dmp

Filesize
8.4MB

Download
memory/1300-149-0x0000000000400000-0x0000000000C71000-memory.dmp

Filesize
8.4MB

Download
memory/1300-150-0x000002C3E6730000-0x000002C3E6DFA000-memory.dmp

Filesize
6.8MB

Download