xworm | fb8d21ee3e971bb648b7f537304b480235d9090e09145df66e41d6ed6a6ce0ee

General

Target

XClient.exe
Size

165KB
MD5

4db38791024a474354f9ae3af4ed8104
SHA1

2ec9da25252a6fc3c8c615863e1d0496e073baba
SHA256

fb8d21ee3e971bb648b7f537304b480235d9090e09145df66e41d6ed6a6ce0ee
SHA512

c313d6924cdadd96bcd3af8d7f648466505724fa638edc04b83380fbe1242435bc428e6f5fa28a6d0702d9398b3acf1d5b9f91b296b3c5c8b6cd7d4e35e88826
SSDEEP

3072:tGpWRKt3Gqbtz/Ri7OujBBz65/M6If+3Js+3JFkKeTno:t4WRabxUbBxBt25

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/6EU9ps8S

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral3/memory/1296-1-0x0000000000E00000-0x0000000000E30000-memory.dmp	family_xworm
behavioral3/files/0x002100000002ae2f-57.dat	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
4576	powershell.exe
1220	powershell.exe
4952	powershell.exe
1520	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
3360	svchost.exe
2392	svchost.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-1-5-21-3449935180-2903586757-2462874082-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
1	pastebin.com
2	pastebin.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
3384	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4576	powershell.exe
4576	powershell.exe
1220	powershell.exe
1220	powershell.exe
4952	powershell.exe
4952	powershell.exe
1520	powershell.exe
1520	powershell.exe
1296	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1296	XClient.exe
Token: SeDebugPrivilege	4576	powershell.exe
Token: SeDebugPrivilege	1220	powershell.exe
Token: SeDebugPrivilege	4952	powershell.exe
Token: SeDebugPrivilege	1520	powershell.exe
Token: SeDebugPrivilege	1296	XClient.exe
Token: SeDebugPrivilege	3360	svchost.exe
Token: SeDebugPrivilege	2392	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1296	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1296 wrote to memory of 4576	1296	XClient.exe	82
PID 1296 wrote to memory of 4576	1296	XClient.exe	82
PID 1296 wrote to memory of 1220	1296	XClient.exe	84
PID 1296 wrote to memory of 1220	1296	XClient.exe	84
PID 1296 wrote to memory of 4952	1296	XClient.exe	86
PID 1296 wrote to memory of 4952	1296	XClient.exe	86
PID 1296 wrote to memory of 1520	1296	XClient.exe	88
PID 1296 wrote to memory of 1520	1296	XClient.exe	88
PID 1296 wrote to memory of 3384	1296	XClient.exe	90
PID 1296 wrote to memory of 3384	1296	XClient.exe	90

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: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1296
- 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:4576
- 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:1220
- 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\svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4952
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1520
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Admin\AppData\Roaming\svchost.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3384

C:\Users\Admin\AppData\Roaming\svchost.exe
C:\Users\Admin\AppData\Roaming\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3360

C:\Users\Admin\AppData\Roaming\svchost.exe
C:\Users\Admin\AppData\Roaming\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2392

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\svchost.exe.log

Filesize
654B

MD5
2cbbb74b7da1f720b48ed31085cbd5b8

SHA1
79caa9a3ea8abe1b9c4326c3633da64a5f724964

SHA256
e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

SHA512
ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

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

Filesize
944B

MD5
e3840d9bcedfe7017e49ee5d05bd1c46

SHA1
272620fb2605bd196df471d62db4b2d280a363c6

SHA256
3ac83e70415b9701ee71a4560232d7998e00c3db020fde669eb01b8821d2746f

SHA512
76adc88ab3930acc6b8b7668e2de797b8c00edcfc41660ee4485259c72a8adf162db62c2621ead5a9950f12bfe8a76ccab79d02fda11860afb0e217812cac376

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

Filesize
944B

MD5
80707036df540b6657f9d443b449e3c3

SHA1
b3e7d5d97274942164bf93c8c4b8a9b68713f46f

SHA256
6651e5f976619cef991deef61776cf43d4c4b3d7c551dd2192b647df71586ab0

SHA512
65e41e9e730fed4f7a7d3f6f35875a16948b897f87c8c70b371fd0ac7f0951814f6a75e7698665194bbc65a3665a684e7be229e7e24193b50483ae7e55eebf4f

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

Filesize
944B

MD5
0b59f3fa12628f63b5713c4833570d7f

SHA1
badcf18f1fdc94b1eadf63f27c09ad092c4a6ccb

SHA256
2332e52881483559d787508831c00192c4f0a4fedc232b0309e566a30247af1d

SHA512
01724fd9f7a20ec5ff3d2686593d5d95069135834e9b156ced36985067fb36e7b3ec2a0018e41fa125ad5d1e42c80be9e148632a9b655f2d41c1400a4320abe7

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1tr1bcts.k4k.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\svchost.exe

Filesize
165KB

MD5
4db38791024a474354f9ae3af4ed8104

SHA1
2ec9da25252a6fc3c8c615863e1d0496e073baba

SHA256
fb8d21ee3e971bb648b7f537304b480235d9090e09145df66e41d6ed6a6ce0ee

SHA512
c313d6924cdadd96bcd3af8d7f648466505724fa638edc04b83380fbe1242435bc428e6f5fa28a6d0702d9398b3acf1d5b9f91b296b3c5c8b6cd7d4e35e88826

Download Submit
memory/1296-1-0x0000000000E00000-0x0000000000E30000-memory.dmp

Filesize
192KB

Download
memory/1296-0-0x00007FFA70E73000-0x00007FFA70E75000-memory.dmp

Filesize
8KB

Download
memory/1296-56-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/1296-55-0x00007FFA70E73000-0x00007FFA70E75000-memory.dmp

Filesize
8KB

Download
memory/1296-54-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-11-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-18-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-15-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-14-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-13-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-12-0x00007FFA70E70000-0x00007FFA71932000-memory.dmp

Filesize
10.8MB

Download
memory/4576-10-0x000001D8E8880000-0x000001D8E88A2000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads