xworm | d827efd4baabed4851bfe8c28258f7cf4cb2597b7300689d36aadeb39ba5e166

General

Target

XClient.exe
Size

60KB
MD5

1588f8abaad3046ed9d4c534fb907a71
SHA1

82241a8e9a48388b6f1f7d2c1142558249b46f05
SHA256

d827efd4baabed4851bfe8c28258f7cf4cb2597b7300689d36aadeb39ba5e166
SHA512

d80068df0603f4f6856b9d822757f4845e757ab5024bc2f15d1a2071ce37b3479bef834a9a095350b4ca41be994f6f92fc6c36502092aaff7bac66f6ac1d82d9
SSDEEP

1536:eMj0J0WjbLpHpGbflpG/s16OO4AUpCXB:XgWbfy/YO4AnX

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

press-approaches.gl.at.ply.gg:54490

Attributes

Install_directory
%ProgramData%
install_file
$77wsappx.exe

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/memory/2384-1-0x0000000000E60000-0x0000000000E76000-memory.dmp	family_xworm
behavioral1/files/0x000d000000012029-36.dat	family_xworm
behavioral1/memory/1676-38-0x0000000001120000-0x0000000001136000-memory.dmp	family_xworm

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

pid	Process
2128	powershell.exe
2236	powershell.exe
2836	powershell.exe
2516	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77wsappx.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77wsappx.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
1676	$77wsappx.exe
2184	$77wsappx.exe

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-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\$77wsappx = "C:\\ProgramData\\$77wsappx.exe"	XClient.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
4	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
2556	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2384	XClient.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2128	powershell.exe
2236	powershell.exe
2836	powershell.exe
2516	powershell.exe
2384	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2384	XClient.exe
Token: SeDebugPrivilege	2128	powershell.exe
Token: SeDebugPrivilege	2236	powershell.exe
Token: SeDebugPrivilege	2836	powershell.exe
Token: SeDebugPrivilege	2516	powershell.exe
Token: SeDebugPrivilege	2384	XClient.exe
Token: SeDebugPrivilege	1676	$77wsappx.exe
Token: SeDebugPrivilege	2184	$77wsappx.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2384	XClient.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 2128	2384	XClient.exe	29
PID 2384 wrote to memory of 2128	2384	XClient.exe	29
PID 2384 wrote to memory of 2128	2384	XClient.exe	29
PID 2384 wrote to memory of 2236	2384	XClient.exe	31
PID 2384 wrote to memory of 2236	2384	XClient.exe	31
PID 2384 wrote to memory of 2236	2384	XClient.exe	31
PID 2384 wrote to memory of 2836	2384	XClient.exe	33
PID 2384 wrote to memory of 2836	2384	XClient.exe	33
PID 2384 wrote to memory of 2836	2384	XClient.exe	33
PID 2384 wrote to memory of 2516	2384	XClient.exe	35
PID 2384 wrote to memory of 2516	2384	XClient.exe	35
PID 2384 wrote to memory of 2516	2384	XClient.exe	35
PID 2384 wrote to memory of 2556	2384	XClient.exe	37
PID 2384 wrote to memory of 2556	2384	XClient.exe	37
PID 2384 wrote to memory of 2556	2384	XClient.exe	37
PID 2720 wrote to memory of 1676	2720	taskeng.exe	42
PID 2720 wrote to memory of 1676	2720	taskeng.exe	42
PID 2720 wrote to memory of 1676	2720	taskeng.exe	42
PID 2720 wrote to memory of 2184	2720	taskeng.exe	43
PID 2720 wrote to memory of 2184	2720	taskeng.exe	43
PID 2720 wrote to memory of 2184	2720	taskeng.exe	43

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\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2384
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2128
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2236
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\$77wsappx.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2836
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '$77wsappx.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2516
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "$77wsappx" /tr "C:\ProgramData\$77wsappx.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2556

C:\Windows\system32\taskeng.exe
taskeng.exe {B2562A6E-6943-44EC-B903-AA2B89395AAA} S-1-5-21-3533259084-2542256011-65585152-1000:XPAJOTIY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:2720
- C:\ProgramData\$77wsappx.exe
  C:\ProgramData\$77wsappx.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1676
- C:\ProgramData\$77wsappx.exe
  C:\ProgramData\$77wsappx.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2184

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\$77wsappx.exe

Filesize
60KB

MD5
1588f8abaad3046ed9d4c534fb907a71

SHA1
82241a8e9a48388b6f1f7d2c1142558249b46f05

SHA256
d827efd4baabed4851bfe8c28258f7cf4cb2597b7300689d36aadeb39ba5e166

SHA512
d80068df0603f4f6856b9d822757f4845e757ab5024bc2f15d1a2071ce37b3479bef834a9a095350b4ca41be994f6f92fc6c36502092aaff7bac66f6ac1d82d9

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\7T8CCGTVDMIGW6NX0RAQ.temp

Filesize
7KB

MD5
658d5091b2ddaf9e5bdcb0aa82d8b95f

SHA1
7c7fa43f12ccbc8d042debfe759413a954055d70

SHA256
724243bc99a8adedca75dd6c12e364c984911ac5e7b42088ec643450f20db1b0

SHA512
ad76c26d749e32df027eb2eadc0b5aab12c9349f053d3d514369fbd766f341eb3fd943b12dd7b3d89abe9ab0962e29e66573f612dd95cee181dd4e5e74d4549e

Download Submit
memory/1676-38-0x0000000001120000-0x0000000001136000-memory.dmp

Filesize
88KB

Download
memory/2128-8-0x00000000027C0000-0x0000000002840000-memory.dmp

Filesize
512KB

Download
memory/2128-9-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

Filesize
2.9MB

Download
memory/2128-10-0x0000000002960000-0x0000000002968000-memory.dmp

Filesize
32KB

Download
memory/2236-17-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download
memory/2236-16-0x000000001B590000-0x000000001B872000-memory.dmp

Filesize
2.9MB

Download
memory/2384-0-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

Filesize
4KB

Download
memory/2384-7-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

Filesize
4KB

Download
memory/2384-34-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-2-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-1-0x0000000000E60000-0x0000000000E76000-memory.dmp

Filesize
88KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads