stormkitty | b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23

Analysis

max time kernel
299s
max time network
304s
platform
windows11-21h2_x64
resource
win11-20240709-en
resource tags

arch:x64arch:x86image:win11-20240709-enlocale:en-usos:windows11-21h2-x64system
submitted
22/07/2024, 19:01

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General

Target
Registry.exe
Size 77KB
Sample240722-xpppvatanm
SHA256 b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23
MD5 9d6650618c58c87940342a370a32e509
SHA1 c579fae20e78573deeec2059c8119083ccdff7e2
SHA512 d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020
SSDEEP 1536:BQa31Z6Y6BFzJufgQIUbmVCcGDl4gBQOV8EaKiRE:BQZhB5IYTUbm1Yl4SQOV8EqE
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stormkitty xworm persistence rat spyware stealer trojan

Malware Config

Extracted

Family

xworm

147.185.221.20:49485

Attributes

Install_directory
%Userprofile%
install_file
System.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral3/memory/3396-1-0x0000000000440000-0x000000000045A000-memory.dmp	family_xworm
behavioral3/files/0x000600000002aa54-7.dat	family_xworm

StormKitty
StormKitty is an open source info stealer written in C#.
stealer stormkitty

StormKitty payload 1 IoCs

resource	yara_rule
behavioral3/memory/3396-18-0x000000001BB70000-0x000000001BC8E000-memory.dmp	family_stormkitty

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System.lnk	Registry.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System.lnk	Registry.exe

Executes dropped EXE 5 IoCs

pid	Process
1288	System
2020	System
4164	System
1076	System
1716	System

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

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-1-5-21-514081398-208714212-3319599467-1000\Software\Microsoft\Windows\CurrentVersion\Run\System = "C:\\Users\\Admin\\System"	Registry.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	ip-api.com

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4604	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3396	Registry.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	3396	Registry.exe
Token: SeDebugPrivilege	3396	Registry.exe
Token: SeDebugPrivilege	1288	System
Token: SeDebugPrivilege	2020	System
Token: SeDebugPrivilege	4164	System
Token: SeDebugPrivilege	1076	System
Token: SeDebugPrivilege	1716	System

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3396	Registry.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3396 wrote to memory of 4604	3396	Registry.exe	79
PID 3396 wrote to memory of 4604	3396	Registry.exe	79

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Registry.exe
"C:\Users\Admin\AppData\Local\Temp\Registry.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3396
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System" /tr "C:\Users\Admin\System"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4604

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1288

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2020

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4164

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1076

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1716

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

System.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\System.log
Size 654B
SHA256 e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3
MD5 2cbbb74b7da1f720b48ed31085cbd5b8
SHA1 79caa9a3ea8abe1b9c4326c3633da64a5f724964
SHA512 ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9
MD5 SHA1 SHA512

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System

Path C:\Users\Admin\System
Size 77KB
SHA256 b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23
MD5 9d6650618c58c87940342a370a32e509
SHA1 c579fae20e78573deeec2059c8119083ccdff7e2
SHA512 d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020
SSDEEP 1536:BQa31Z6Y6BFzJufgQIUbmVCcGDl4gBQOV8EaKiRE:BQZhB5IYTUbm1Yl4SQOV8EqE
MD5 SHA1 SHA512 SSDEEP

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memory/1288-9-0x00007FF887550000-0x00007FF888012000-memory.dmp

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memory/1288-11-0x00007FF887550000-0x00007FF888012000-memory.dmp

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memory/3396-1-0x0000000000440000-0x000000000045A000-memory.dmp

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memory/3396-0-0x00007FF887553000-0x00007FF887555000-memory.dmp

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memory/3396-2-0x00007FF887550000-0x00007FF888012000-memory.dmp

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memory/3396-6-0x00007FF887550000-0x00007FF888012000-memory.dmp

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memory/3396-18-0x000000001BB70000-0x000000001BC8E000-memory.dmp

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memory/3396-57-0x000000001BCD0000-0x000000001BCF2000-memory.dmp

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