xworm | 69b4f3e7db53a18e1352367ecbf25dba0b86e96af655e6127db1b1205a181f63

General

Target

csrss.exe
Size

40KB
MD5

e5cb8c66cab6a972529a85480b9881bc
SHA1

58eb0e24f0eb4865838d307df886d2b40bfb77cd
SHA256

69b4f3e7db53a18e1352367ecbf25dba0b86e96af655e6127db1b1205a181f63
SHA512

6c049e084e00eea72b3b78480fb79879c8c961d188178b3c59211bbc69ab25deaf88453dc1f4ec23c08ee80e452a453464780193e849121f2f625f96f0dd26f3
SSDEEP

768:uNfPMSk3K/EzTb/0x8WuFZ4lJF5PC9O9EB68OMh63/aO:uf05a/CTjM89UFc9UEB68OMsx

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

45.141.26.119:1996

Mutex

wHK5NlknpAL3Lk1X

Attributes

Install_directory
%AppData%
install_file
csrss.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3272-1-0x0000000000820000-0x0000000000830000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

4860 powershell.exe
3592 powershell.exe
2892 powershell.exe
3500 powershell.exe
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

csrss.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation csrss.exe

pid	process
4860	powershell.exe
3592	powershell.exe
2892	powershell.exe
3500	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	csrss.exe

Drops startup file 2 IoCs

Processes:

csrss.exe

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

27 ip-api.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

flow	ioc
27	ip-api.com

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.execsrss.exe

pid	process
2892	powershell.exe
2892	powershell.exe
3500	powershell.exe
3500	powershell.exe
4860	powershell.exe
4860	powershell.exe
3592	powershell.exe
3592	powershell.exe
3272	csrss.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

csrss.exepowershell.exepowershell.exepowershell.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	3272	csrss.exe
Token: SeDebugPrivilege	2892	powershell.exe
Token: SeDebugPrivilege	3500	powershell.exe
Token: SeDebugPrivilege	4860	powershell.exe
Token: SeDebugPrivilege	3592	powershell.exe
Token: SeDebugPrivilege	3272	csrss.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

csrss.exe

pid process

3272 csrss.exe

pid	process
3272	csrss.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

csrss.exe

description	pid	process	target process
PID 3272 wrote to memory of 2892	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 2892	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 3500	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 3500	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 4860	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 4860	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 3592	3272	csrss.exe	powershell.exe
PID 3272 wrote to memory of 3592	3272	csrss.exe	powershell.exe

C:\Users\Admin\AppData\Local\Temp\csrss.exe
"C:\Users\Admin\AppData\Local\Temp\csrss.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3272

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\csrss.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2892

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'csrss.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3500

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\csrss.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4860

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'csrss.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3592

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
944B

MD5
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
944B

MD5
fd98baf5a9c30d41317663898985593b

SHA1
ea300b99f723d2429d75a6c40e0838bf60f17aad

SHA256
9d97a5bbc88fdcceac25f293383f7e5ce242675460ffbfb2ee9090870c034e96

SHA512
bf4dbbd671b5d7afb326622a7c781f150860294d3dba7160330046c258c84a15981c70e50d84dc7faaa7cc8b8c90bf8df818b3f2d3806a8a3671dfe5e38fe7b0

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
944B

MD5
a9293ef980c925abe33d940554ed8575

SHA1
9b6d85f2595f7fd4923f52b21ab7607279066969

SHA256
8313a191aa9d11cce868d95ac9a9b1609275bfe93131fcb6e547b985b0242fbe

SHA512
2003d90bb2bc89378ccaeb9c5edf76b2dfd93c80369d063e56141abb8d7fea6acee6a103874ab227bc1548437269c8e4ee5174bf482ecf3d66c38f3e0ba35d85

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ieip5ree.jq2.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2892-13-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

Filesize
10.8MB

Download
memory/2892-14-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

Filesize
10.8MB

Download
memory/2892-17-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

Filesize
10.8MB

Download
memory/2892-12-0x00007FFAC0F20000-0x00007FFAC19E1000-memory.dmp

Filesize
10.8MB

Download
memory/2892-2-0x0000020D54250000-0x0000020D54272000-memory.dmp

Filesize
136KB

Download
memory/3272-0-0x00007FFAC0F23000-0x00007FFAC0F25000-memory.dmp

Filesize
8KB

Download
memory/3272-1-0x0000000000820000-0x0000000000830000-memory.dmp

Filesize
64KB

Download
memory/3272-56-0x00007FFAC0F23000-0x00007FFAC0F25000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

Loading Replay Monitor...

Downloads