shurk | 1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21

Analysis

max time kernel
149s
max time network
167s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
30-11-2022 16:34

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General

Target

1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe
Size

6.5MB
MD5

9419ee4ef3337a61b5f7a0a3949d2a8d
SHA1

04988d7cb660cab4ea2d8c01deae8559a8f11532
SHA256

1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21
SHA512

58a3308f62e73de811bebcafa66bf0d153773ea948044af3312ad1f70e466d2b1ba00cce29437be5cb1289a3f2d291c036f2d579c6c8512fbe940adbe8be77a3
SSDEEP

98304:NyrC8gMtKbCXjn9IQX5uGiylK8p/DaCO0Y54WxTIln+HTocMxJa67EANewDbXwll:N2C8gHbCXZ3XQsKIanF0n3uQXbqIK

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
behavioral1/files/0x0007000000012758-56.dat	shurk_stealer

Executes dropped EXE 1 IoCs

pid	Process
1788	WINRAR~2.EXE

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.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
T1081

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1788	WINRAR~2.EXE

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 288 wrote to memory of 1788	288	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe	27
PID 288 wrote to memory of 1788	288	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe	27
PID 288 wrote to memory of 1788	288	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe	27
PID 288 wrote to memory of 1788	288	1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe	27

C:\Users\Admin\AppData\Local\Temp\1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe
"C:\Users\Admin\AppData\Local\Temp\1f74b7fcaec2411cd90a37b98550fc7e37016fe3ce84a169a859588eda4cbc21.exe"
1⤵
- Checks BIOS information in registry
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:288
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\WINRAR~2.EXE
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\WINRAR~2.EXE
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  PID:1788

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

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\IXP000.TMP\WINRAR~2.EXE

Filesize
490KB

MD5
4a7d68567152344a29b4c6501f95ec07

SHA1
9e964e8a58c21d55756eb63013e8e12b071e92a1

SHA256
4fba76f8161955ba741ac19f40e4e43bc8086707e8c2ccd624f95054abbc59cf

SHA512
7adb1b17872c2a297899ab6e19636d128211005165dd38239a5ad056a9d118e32824e12d65033cd054e0ffe0a2df08ad5fead1dda8f9052c0fe2de5de61bbf28

Download Submit
memory/288-54-0x000007FEFB6A1000-0x000007FEFB6A3000-memory.dmp

Filesize
8KB

Download
memory/288-57-0x000000013F230000-0x000000013F847000-memory.dmp

Filesize
6.1MB

Download
memory/288-58-0x0000000076E20000-0x0000000076FC9000-memory.dmp

Filesize
1.7MB

Download