stormkitty | b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23 | Triage

Analysis

max time kernel
147s
max time network
153s
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 19:05

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General

Target

Registry.exe
Size

77KB
MD5

9d6650618c58c87940342a370a32e509
SHA1

c579fae20e78573deeec2059c8119083ccdff7e2
SHA256

b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23
SHA512

d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020
SSDEEP

1536:BQa31Z6Y6BFzJufgQIUbmVCcGDl4gBQOV8EaKiRE:BQZhB5IYTUbm1Yl4SQOV8EqE

Score

10^/10

stormkitty xworm persistence rat spyware stealer trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.20:49485

Attributes

Install_directory
%Userprofile%
install_file
System.exe

Signatures

Detect Xworm Payload 2 IoCs

Processes:

resource	yara_rule
behavioral4/memory/5732-1-0x0000000000AF0000-0x0000000000B0A000-memory.dmp	family_xworm
C:\Users\Admin\System	family_xworm

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

StormKitty payload 1 IoCs

Processes:

resource	yara_rule
behavioral4/memory/5732-17-0x000000001C210000-0x000000001C32E000-memory.dmp	family_stormkitty

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

Drops startup file 2 IoCs

Processes:

Registry.exe

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 3 IoCs

Processes:

SystemSystemSystem

pid process

2472 System
5012 System
3984 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

Registry Run Keys / Startup Folder

Modify Registry

Processes:

Registry.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3666881604-935092360-1617577973-1000\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.

Processes:

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

Processes:

schtasks.exe

pid process

904 schtasks.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

Registry.exe

pid process

5732 Registry.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

Registry.exeSystemSystemSystem

description	pid	process
Token: SeDebugPrivilege	5732	Registry.exe
Token: SeDebugPrivilege	5732	Registry.exe
Token: SeDebugPrivilege	2472	System
Token: SeDebugPrivilege	5012	System
Token: SeDebugPrivilege	3984	System

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Registry.exe

pid process

5732 Registry.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

Registry.exe

description	pid	process	target process
PID 5732 wrote to memory of 904	5732	Registry.exe	schtasks.exe
PID 5732 wrote to memory of 904	5732	Registry.exe	schtasks.exe

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:5732

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:904

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2472

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5012

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3984

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Defense Evasion

Modify Registry

Credential Access

Unsecured Credentials

Credentials In Files

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Data from Local System

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\System.log

Filesize
654B

MD5
2cbbb74b7da1f720b48ed31085cbd5b8

SHA1
79caa9a3ea8abe1b9c4326c3633da64a5f724964

SHA256
e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

SHA512
ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

Download Submit
C:\Users\Admin\System

Filesize
77KB

MD5
9d6650618c58c87940342a370a32e509

SHA1
c579fae20e78573deeec2059c8119083ccdff7e2

SHA256
b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23

SHA512
d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020

Download Submit
memory/2472-8-0x00007FFBB88D0000-0x00007FFBB9392000-memory.dmp

Filesize
10.8MB

Download
memory/2472-10-0x00007FFBB88D0000-0x00007FFBB9392000-memory.dmp

Filesize
10.8MB

Download
memory/5732-0-0x00007FFBB88D3000-0x00007FFBB88D5000-memory.dmp

Filesize
8KB

Download
memory/5732-1-0x0000000000AF0000-0x0000000000B0A000-memory.dmp

Filesize
104KB

Download
memory/5732-2-0x00007FFBB88D0000-0x00007FFBB9392000-memory.dmp

Filesize
10.8MB

Download
memory/5732-11-0x00007FFBB88D3000-0x00007FFBB88D5000-memory.dmp

Filesize
8KB

Download
memory/5732-12-0x00007FFBB88D0000-0x00007FFBB9392000-memory.dmp

Filesize
10.8MB

Download
memory/5732-17-0x000000001C210000-0x000000001C32E000-memory.dmp

Filesize
1.1MB

Download
memory/5732-56-0x000000001C360000-0x000000001C382000-memory.dmp

Filesize
136KB

Download