xworm | c6ac39bb6bd04c72e7c1f23b6d98b7a3ae591efa9ef285458b27bef353a255cb

General

Target

extfix.exe
Size

75KB
MD5

03ac7cea640de499ffd4d820cbf91aec
SHA1

c5431178ad49172a65398770a03fecccc37f711f
SHA256

c6ac39bb6bd04c72e7c1f23b6d98b7a3ae591efa9ef285458b27bef353a255cb
SHA512

52186a0938de15b83873626f72f594219dc193b1d5b7fbec5d2577761488f3379d5cd42e6de205964f6dec5cdfc3023de36375da28a0146a5311ab0516f23d7c
SSDEEP

1536:2L1YZRemnhY0X1+Q3jaHPjbIbnFJ8v6sqKoO4o0iD8:22ZPhhzOHobnv6oOz0iA

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

C2

127.0.0.1:64112

FRERE-57054.portmap.host:64112

solutions-stunning.gl.at.ply.gg:64112:64112

solutions-stunning.gl.at.ply.gg:64112

Attributes

Install_directory
%Public%
install_file
XClient.exe

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/1872-1-0x0000000000880000-0x000000000089A000-memory.dmp	family_xworm
behavioral1/files/0x000a0000000120ff-32.dat	family_xworm
behavioral1/memory/2248-34-0x0000000000C70000-0x0000000000C8A000-memory.dmp	family_xworm
behavioral1/memory/2204-36-0x00000000001C0000-0x00000000001DA000-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
2804	powershell.exe
2768	powershell.exe
2256	powershell.exe
2528	powershell.exe

Executes dropped EXE 3 IoCs

pid	Process
2248	XClient.exe
2204	XClient.exe
868	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
2468	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2256	powershell.exe
2528	powershell.exe
2804	powershell.exe
2768	powershell.exe
1872	extfix.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	1872	extfix.exe
Token: SeDebugPrivilege	2256	powershell.exe
Token: SeDebugPrivilege	2528	powershell.exe
Token: SeDebugPrivilege	2804	powershell.exe
Token: SeDebugPrivilege	2768	powershell.exe
Token: SeDebugPrivilege	1872	extfix.exe
Token: SeDebugPrivilege	2248	XClient.exe
Token: SeDebugPrivilege	2204	XClient.exe
Token: SeDebugPrivilege	868	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1872	extfix.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1872 wrote to memory of 2256	1872	extfix.exe	29
PID 1872 wrote to memory of 2256	1872	extfix.exe	29
PID 1872 wrote to memory of 2256	1872	extfix.exe	29
PID 1872 wrote to memory of 2528	1872	extfix.exe	31
PID 1872 wrote to memory of 2528	1872	extfix.exe	31
PID 1872 wrote to memory of 2528	1872	extfix.exe	31
PID 1872 wrote to memory of 2804	1872	extfix.exe	33
PID 1872 wrote to memory of 2804	1872	extfix.exe	33
PID 1872 wrote to memory of 2804	1872	extfix.exe	33
PID 1872 wrote to memory of 2768	1872	extfix.exe	35
PID 1872 wrote to memory of 2768	1872	extfix.exe	35
PID 1872 wrote to memory of 2768	1872	extfix.exe	35
PID 1872 wrote to memory of 2468	1872	extfix.exe	37
PID 1872 wrote to memory of 2468	1872	extfix.exe	37
PID 1872 wrote to memory of 2468	1872	extfix.exe	37
PID 812 wrote to memory of 2248	812	taskeng.exe	42
PID 812 wrote to memory of 2248	812	taskeng.exe	42
PID 812 wrote to memory of 2248	812	taskeng.exe	42
PID 812 wrote to memory of 2204	812	taskeng.exe	43
PID 812 wrote to memory of 2204	812	taskeng.exe	43
PID 812 wrote to memory of 2204	812	taskeng.exe	43
PID 812 wrote to memory of 868	812	taskeng.exe	44
PID 812 wrote to memory of 868	812	taskeng.exe	44
PID 812 wrote to memory of 868	812	taskeng.exe	44

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\extfix.exe
"C:\Users\Admin\AppData\Local\Temp\extfix.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1872
- 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\extfix.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2256
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'extfix.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2528
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2804
- 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:2768
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Public\XClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2468

C:\Windows\system32\taskeng.exe
taskeng.exe {1CBB23E7-F9D2-4C14-B3B6-06FF15B75565} S-1-5-21-3533259084-2542256011-65585152-1000:XPAJOTIY\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:812
- C:\Users\Public\XClient.exe
  C:\Users\Public\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2248
- C:\Users\Public\XClient.exe
  C:\Users\Public\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2204
- C:\Users\Public\XClient.exe
  C:\Users\Public\XClient.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:868

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

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
2d28dc46f49586d61d8953e88d7cfdf8

SHA1
ca384091033206e848f8e7fa9b305165c1b58be4

SHA256
6e06933ef5961b5190819716e31be86a7ae6cbefde6d98b1d46d220ab5acede6

SHA512
8f8de47f5590da2ce0412976defd631518e32aa79bd421631b643566475875fc76940f17da731cb9274220be4bbb562de0a1b893e38d70e2b6772a4267ea0602

Download Submit
C:\Users\Public\XClient.exe

Filesize
75KB

MD5
03ac7cea640de499ffd4d820cbf91aec

SHA1
c5431178ad49172a65398770a03fecccc37f711f

SHA256
c6ac39bb6bd04c72e7c1f23b6d98b7a3ae591efa9ef285458b27bef353a255cb

SHA512
52186a0938de15b83873626f72f594219dc193b1d5b7fbec5d2577761488f3379d5cd42e6de205964f6dec5cdfc3023de36375da28a0146a5311ab0516f23d7c

Download Submit
memory/1872-2-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

Filesize
9.9MB

Download
memory/1872-0-0x000007FEF5CC3000-0x000007FEF5CC4000-memory.dmp

Filesize
4KB

Download
memory/1872-28-0x000007FEF5CC3000-0x000007FEF5CC4000-memory.dmp

Filesize
4KB

Download
memory/1872-30-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

Filesize
9.9MB

Download
memory/1872-1-0x0000000000880000-0x000000000089A000-memory.dmp

Filesize
104KB

Download
memory/2204-36-0x00000000001C0000-0x00000000001DA000-memory.dmp

Filesize
104KB

Download
memory/2248-34-0x0000000000C70000-0x0000000000C8A000-memory.dmp

Filesize
104KB

Download
memory/2256-7-0x0000000002930000-0x00000000029B0000-memory.dmp

Filesize
512KB

Download
memory/2256-8-0x000000001B790000-0x000000001BA72000-memory.dmp

Filesize
2.9MB

Download
memory/2256-9-0x0000000002910000-0x0000000002918000-memory.dmp

Filesize
32KB

Download
memory/2528-15-0x000000001B690000-0x000000001B972000-memory.dmp

Filesize
2.9MB

Download
memory/2528-16-0x0000000000400000-0x0000000000408000-memory.dmp

Filesize
32KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads