xworm | 5d27d172d7910c67b668b31ed29826e973f1a78fb217b0dd4f40dcafe86bb6a2

General

Target

XClient.sfx.exe
Size

427KB
MD5

5435de027987f5f1f608719b0c8a752b
SHA1

b341e00d0bce1b8e085aaa7880c1e130bb6b3976
SHA256

5d27d172d7910c67b668b31ed29826e973f1a78fb217b0dd4f40dcafe86bb6a2
SHA512

fa75b2b27a2f1696b6dfac5fc6944f2501200eae3daaa449db3721d34c185435e82cf7c900b5f4c477185c5c9a410290e2ba9c93f7375e6810e90e61651d5d87
SSDEEP

6144:x5aMJNLwL73PZPkFr1jilzqqVWk6855JKSFtIooEbQYT+t1PNmSiqqvCr:xOxPkPjQeqQ1Y53KRYT+t1PABqv

Score

10^/10

Malware Config

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0008000000023c9b-4.dat	family_xworm
behavioral2/memory/1724-13-0x0000000000B40000-0x0000000000B5A000-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 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
5096	powershell.exe
2620	powershell.exe
4304	powershell.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	XClient.sfx.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 3 IoCs

pid	Process
1724	XClient.exe
3976	XClient.exe
4844	XClient.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-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Local\\XClient.exe"	XClient.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5052	timeout.exe

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
4620	schtasks.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2620	powershell.exe
2620	powershell.exe
4304	powershell.exe
4304	powershell.exe
5096	powershell.exe
5096	powershell.exe
1724	XClient.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1724	XClient.exe
Token: SeDebugPrivilege	2620	powershell.exe
Token: SeDebugPrivilege	4304	powershell.exe
Token: SeDebugPrivilege	5096	powershell.exe
Token: SeDebugPrivilege	1724	XClient.exe
Token: SeDebugPrivilege	3976	XClient.exe
Token: SeDebugPrivilege	4844	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1724	XClient.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 4976 wrote to memory of 1724	4976	XClient.sfx.exe	83
PID 4976 wrote to memory of 1724	4976	XClient.sfx.exe	83
PID 1724 wrote to memory of 2620	1724	XClient.exe	85
PID 1724 wrote to memory of 2620	1724	XClient.exe	85
PID 1724 wrote to memory of 4304	1724	XClient.exe	87
PID 1724 wrote to memory of 4304	1724	XClient.exe	87
PID 1724 wrote to memory of 5096	1724	XClient.exe	89
PID 1724 wrote to memory of 5096	1724	XClient.exe	89
PID 1724 wrote to memory of 4620	1724	XClient.exe	91
PID 1724 wrote to memory of 4620	1724	XClient.exe	91
PID 1724 wrote to memory of 1644	1724	XClient.exe	104
PID 1724 wrote to memory of 1644	1724	XClient.exe	104
PID 1724 wrote to memory of 2136	1724	XClient.exe	106
PID 1724 wrote to memory of 2136	1724	XClient.exe	106
PID 2136 wrote to memory of 5052	2136	cmd.exe	108
PID 2136 wrote to memory of 5052	2136	cmd.exe	108

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.sfx.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.sfx.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4976
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\XClient.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\XClient.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1724
- - 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\RarSFX0\XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2620
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4304
- - 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\XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5096
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\Users\Admin\AppData\Local\XClient.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4620
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "XClient"
    3⤵
    PID:1644
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFAA7.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2136
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:5052

C:\Users\Admin\AppData\Local\XClient.exe
C:\Users\Admin\AppData\Local\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3976

C:\Users\Admin\AppData\Local\XClient.exe
C:\Users\Admin\AppData\Local\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4844

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
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
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
944B

MD5
04114c0529b116bf66d764ff6a5a8fe3

SHA1
0caeff17d1b2190f76c9bf539105f6c40c92bd14

SHA256
fd7092b4e273314186bad6ce71aa4cd69450736b6ec6cc746868997ff82a7532

SHA512
6a718c330824346606ef24f71cca6be0bfafc626b1d2b060b36e919ab07f3d6a345f56cace8a5a84ffbe2183976eb197842c9fd2f3e3b8c8dd307057d59d6f26

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\XClient.exe

Filesize
80KB

MD5
bee4a56d9ba0426d3c95dde1970f6429

SHA1
2bfa99521d4a4f2ed6f9b457074ecf1fae7cd712

SHA256
d6684b27eb3b9913fd9742bf3ce9c38e5f089211b0c105893e44eeaf79f691a2

SHA512
294855ac413dec844467c23ddef1dd87334d0f83f5053a6e9e0b66f032d48e748351f4fa95e166d33c4385c4734d4f4af27365d3379d480a5b5a8ecb30e5f660

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_uw4o11j3.c54.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpFAA7.tmp.bat

Filesize
167B

MD5
833196d9f62272760861f59d4fa55f49

SHA1
555e6484f7041e46cadd3bed3f71491c83d12605

SHA256
c976fe5c3ed2a1864e3cb9b35557aeb18ab5a6d90e4ae8e08d38c9cd5e59a7ea

SHA512
d1a06e69a42e8a0f91408df58a4398d04dc169965be650b58822ed0a497324ef398441ffc807a9410fc8894a794493fcd1e0a5a398cd0136ac56f7797554849f

Download Submit
memory/1724-58-0x00007FFDD3503000-0x00007FFDD3505000-memory.dmp

Filesize
8KB

Download
memory/1724-57-0x00007FFDD3500000-0x00007FFDD3FC1000-memory.dmp

Filesize
10.8MB

Download
memory/1724-61-0x00007FFDD3500000-0x00007FFDD3FC1000-memory.dmp

Filesize
10.8MB

Download
memory/1724-13-0x0000000000B40000-0x0000000000B5A000-memory.dmp

Filesize
104KB

Download
memory/1724-71-0x00007FFDD3500000-0x00007FFDD3FC1000-memory.dmp

Filesize
10.8MB

Download
memory/1724-12-0x00007FFDD3503000-0x00007FFDD3505000-memory.dmp

Filesize
8KB

Download
memory/2620-14-0x000002237D130000-0x000002237D152000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads