xworm | 40757554eb21a52d4700d04e7247042974e177f13370d799f115be591d16ce63

General

Target

xcvvcxt.exe
Size

71KB
MD5

52d2a1a3deaeef7265f59db93f08f6a8
SHA1

f149bd23adbdd98bd1eaf67960d6ea50ad9a6abb
SHA256

40757554eb21a52d4700d04e7247042974e177f13370d799f115be591d16ce63
SHA512

c5013a3bb4ff061c4f0e36ade32dcc86be69dbe28516600597329c0a53c467e2b2300a10196aa88d2ef97a405f9c002a87c5e64503a0242a9ecfe502eb75bc0d
SSDEEP

1536:aDiF2GFihkZNcSKYjUoA6ybueXcMS2+fL6AOOAcdt+RnMX:uiXJZaPYgAybpX3S2+hOOADFMX

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

reason-scoop.gl.at.ply.gg:16546

Attributes

Install_directory
%LocalAppData%
install_file
Java Update Scheduler.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/3468-1-0x00000000007F0000-0x0000000000808000-memory.dmp	family_xworm
behavioral1/files/0x000800000002a920-58.dat	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

pid	Process
2160	powershell.exe
8	powershell.exe
2616	powershell.exe
328	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
3520	Java Update Scheduler.exe
3032	Java Update Scheduler.exe
4812	Java Update Scheduler.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-1-5-21-3761892313-3378554128-2287991803-1000\Software\Microsoft\Windows\CurrentVersion\Run\Java Update Scheduler = "C:\\Users\\Admin\\AppData\\Local\\Java Update Scheduler.exe"	xcvvcxt.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
1900	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2616	powershell.exe
2616	powershell.exe
328	powershell.exe
328	powershell.exe
2160	powershell.exe
2160	powershell.exe
8	powershell.exe
8	powershell.exe
3468	xcvvcxt.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	3468	xcvvcxt.exe
Token: SeDebugPrivilege	2616	powershell.exe
Token: SeDebugPrivilege	328	powershell.exe
Token: SeDebugPrivilege	2160	powershell.exe
Token: SeDebugPrivilege	8	powershell.exe
Token: SeDebugPrivilege	3468	xcvvcxt.exe
Token: SeDebugPrivilege	3520	Java Update Scheduler.exe
Token: SeDebugPrivilege	3032	Java Update Scheduler.exe
Token: SeDebugPrivilege	4812	Java Update Scheduler.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3468	xcvvcxt.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3468 wrote to memory of 2616	3468	xcvvcxt.exe	84
PID 3468 wrote to memory of 2616	3468	xcvvcxt.exe	84
PID 3468 wrote to memory of 328	3468	xcvvcxt.exe	86
PID 3468 wrote to memory of 328	3468	xcvvcxt.exe	86
PID 3468 wrote to memory of 2160	3468	xcvvcxt.exe	89
PID 3468 wrote to memory of 2160	3468	xcvvcxt.exe	89
PID 3468 wrote to memory of 8	3468	xcvvcxt.exe	91
PID 3468 wrote to memory of 8	3468	xcvvcxt.exe	91
PID 3468 wrote to memory of 1900	3468	xcvvcxt.exe	93
PID 3468 wrote to memory of 1900	3468	xcvvcxt.exe	93

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\xcvvcxt.exe
"C:\Users\Admin\AppData\Local\Temp\xcvvcxt.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:3468
- 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\xcvvcxt.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2616
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'xcvvcxt.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:328
- 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\Java Update Scheduler.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2160
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Java Update Scheduler.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:8
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Java Update Scheduler" /tr "C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1900

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2432

C:\Users\Admin\AppData\Local\Java Update Scheduler.exe
"C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3520

C:\Users\Admin\AppData\Local\Java Update Scheduler.exe
"C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3032

C:\Users\Admin\AppData\Local\Java Update Scheduler.exe
"C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4812

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:\Users\Admin\AppData\Local\Java Update Scheduler.exe

Filesize
71KB

MD5
52d2a1a3deaeef7265f59db93f08f6a8

SHA1
f149bd23adbdd98bd1eaf67960d6ea50ad9a6abb

SHA256
40757554eb21a52d4700d04e7247042974e177f13370d799f115be591d16ce63

SHA512
c5013a3bb4ff061c4f0e36ade32dcc86be69dbe28516600597329c0a53c467e2b2300a10196aa88d2ef97a405f9c002a87c5e64503a0242a9ecfe502eb75bc0d

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

Filesize
654B

MD5
2cbbb74b7da1f720b48ed31085cbd5b8

SHA1
79caa9a3ea8abe1b9c4326c3633da64a5f724964

SHA256
e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

SHA512
ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

Download Submit
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\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
fb64985eb65ff03449724256acec5ab0

SHA1
6e65d6919e613eeb21e1efb38dc82d319fdf9bd1

SHA256
1c8634d4efd6aba18bd0c294f82330df95fe2611129b824a0dd108537b308f28

SHA512
364d9caf73d5d2180893250ba17d0611fc5baf5636284b79312e5f232c4f10b2f2c241f522276712f163d8e7124d73cc88ca077a8eb9fb39059475737daa90d3

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

Filesize
944B

MD5
050567a067ffea4eb40fe2eefebdc1ee

SHA1
6e1fb2c7a7976e0724c532449e97722787a00fec

SHA256
3952d5b543e5cb0cb84014f4ad9f5f1b7166f592d28640cbc3d914d0e6f41d2e

SHA512
341ad71ef7e850b10e229666312e4bca87a0ed9fe25ba4b0ab65661d5a0efa855db0592153106da07134d8fc2c6c0e44709bf38183c9a574a1fa543189971259

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_3zhmwwxe.b2o.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2616-19-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/2616-15-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/2616-16-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/2616-14-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/2616-13-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/2616-12-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/2616-11-0x0000027EBC500000-0x0000027EBC522000-memory.dmp

Filesize
136KB

Download
memory/3468-0-0x00007FFE8B1B3000-0x00007FFE8B1B5000-memory.dmp

Filesize
8KB

Download
memory/3468-51-0x00007FFE8B1B3000-0x00007FFE8B1B5000-memory.dmp

Filesize
8KB

Download
memory/3468-56-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/3468-57-0x000000001C260000-0x000000001C26C000-memory.dmp

Filesize
48KB

Download
memory/3468-2-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

Filesize
10.8MB

Download
memory/3468-1-0x00000000007F0000-0x0000000000808000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads