xworm | 37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6b

General

Target

37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe
Size

66KB
MD5

529d7dd2ee40e162ee1e452266cf3370
SHA1

31753fd788e5aa7691983822b5f6bd54ec966e67
SHA256

37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6b
SHA512

5e0e8b1f950fd97bb86cf04f70ca393fb99624fd4061485e9110bac61d55450bcd38dedf494fdc4678d932000cd1984c69804e85f21e083154aade9427d2c6a6
SSDEEP

1536:3neHSDcksj3CGVAfBeVjFu/fWHE0uGxvV6PG:3neHgfsjFVAfBcvce

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

perfect-ringtones.gl.at.ply.gg:15597

Attributes

Install_directory
%AppData%
install_file
XClient.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000b000000023c7f-6.dat	family_xworm
behavioral2/memory/3124-14-0x0000000000BF0000-0x0000000000C04000-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
2364	powershell.exe
948	powershell.exe
3372	powershell.exe
4684	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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\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
3124	Xclient.exe
2396	XClient.exe
3428	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-1-5-21-3227495264-2217614367-4027411560-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.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
17	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
1756	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2364	powershell.exe
2364	powershell.exe
948	powershell.exe
948	powershell.exe
3372	powershell.exe
3372	powershell.exe
4684	powershell.exe
4684	powershell.exe
3124	Xclient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3124	Xclient.exe
Token: SeDebugPrivilege	2364	powershell.exe
Token: SeDebugPrivilege	948	powershell.exe
Token: SeDebugPrivilege	3372	powershell.exe
Token: SeDebugPrivilege	4684	powershell.exe
Token: SeDebugPrivilege	3124	Xclient.exe
Token: SeDebugPrivilege	2396	XClient.exe
Token: SeDebugPrivilege	3428	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3124	Xclient.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 212 wrote to memory of 3124	212	37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe	82
PID 212 wrote to memory of 3124	212	37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe	82
PID 3124 wrote to memory of 2364	3124	Xclient.exe	86
PID 3124 wrote to memory of 2364	3124	Xclient.exe	86
PID 3124 wrote to memory of 948	3124	Xclient.exe	88
PID 3124 wrote to memory of 948	3124	Xclient.exe	88
PID 3124 wrote to memory of 3372	3124	Xclient.exe	91
PID 3124 wrote to memory of 3372	3124	Xclient.exe	91
PID 3124 wrote to memory of 4684	3124	Xclient.exe	93
PID 3124 wrote to memory of 4684	3124	Xclient.exe	93
PID 3124 wrote to memory of 1756	3124	Xclient.exe	95
PID 3124 wrote to memory of 1756	3124	Xclient.exe	95

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\37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe
"C:\Users\Admin\AppData\Local\Temp\37b9b2836d520f80072446950646e5263f7c038d725dce9095fbd3702ca0ba6bN.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:212
- C:\Users\Admin\AppData\Roaming\Xclient.exe
  "C:\Users\Admin\AppData\Roaming\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:3124
- - 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\Xclient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2364
- - 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:948
- - 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\XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3372
- - 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:4684
- - 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\Roaming\XClient.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1756

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2396

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3428

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

Replay Monitor

Loading Replay Monitor...

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
440cb38dbee06645cc8b74d51f6e5f71

SHA1
d7e61da91dc4502e9ae83281b88c1e48584edb7c

SHA256
8ef7a682dfd99ff5b7e9de0e1be43f0016d68695a43c33c028af2635cc15ecfe

SHA512
3aab19578535e6ba0f6beb5690c87d970292100704209d2dcebddcdd46c6bead27588ef5d98729bfd50606a54cc1edf608b3d15bef42c13b9982aaaf15de7fd6

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

Filesize
944B

MD5
359d1e37a264703c99ebd01eed362de5

SHA1
a1122c8bf9848b3371cd191ba540864204d1d845

SHA256
5781f3046b0d978469415a059cf5ceae0e532869e69ab1dffb8ed878bd299b07

SHA512
ce3caa1d2205be8167b7cd48ebf538a9ce8c148643c26a20377894aa15cf00f90b2b5e2ebf35d40a0273c088abc11fe6f010e34691d7fbc4bef8d7e482f5087d

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

Filesize
944B

MD5
29af8a435901d77d6c0a08e494fdd160

SHA1
00ee17be16d2fccd668977caab81546ddceffc5d

SHA256
8774b8e4d75d6815a0d211272e983b0094a7542d1df584f9fc880aa68283a98f

SHA512
7d3e78f5d6d73bbb37ec7ff5b97729a1e542ae6b86eb271516a02ec67eb012872337e57a418a3f7f1b1b8cfafc2bfb246f15b75eaf45ee36fc690d946d873c99

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

Filesize
944B

MD5
dd1d0b083fedf44b482a028fb70b96e8

SHA1
dc9c027937c9f6d52268a1504cbae42a39c8d36a

SHA256
cab7944d29e0501dc0db904ac460ca7a87700e0ec7eb62298b7b97cbf40c424c

SHA512
96bec38bfda176292ae65dcf735103e7888baa212038737c1d1e215fcb76e4c0355e4a827a1934303e7aecae91012fa412f13e38f382b732758bae985cc67973

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zpxctjtw.mmp.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
56KB

MD5
361befaf798238d6fa0eb9a33e6c0857

SHA1
eea78ed5fb05ca4cdd5b287b33d50226cd0586da

SHA256
b0b9917c1fbd92139d919ef85206a6503489a0327053700beee5f1819dec2404

SHA512
3704cab8c32a5a50f8c5c7b68eed3a45dcce89065177322767bbd08c0bd8e98db7c1af86bf86f93164c0d18eaba82935a1e88c4b2e376ea2ddbfb3ed5b6bc01e

Download Submit
memory/212-0-0x00007FFCCA253000-0x00007FFCCA255000-memory.dmp

Filesize
8KB

Download
memory/212-1-0x0000000000850000-0x0000000000866000-memory.dmp

Filesize
88KB

Download
memory/2364-26-0x0000021C24000000-0x0000021C24022000-memory.dmp

Filesize
136KB

Download
memory/3124-16-0x00007FFCCA250000-0x00007FFCCAD11000-memory.dmp

Filesize
10.8MB

Download
memory/3124-15-0x00007FFCCA250000-0x00007FFCCAD11000-memory.dmp

Filesize
10.8MB

Download
memory/3124-14-0x0000000000BF0000-0x0000000000C04000-memory.dmp

Filesize
80KB

Download
memory/3124-64-0x00007FFCCA250000-0x00007FFCCAD11000-memory.dmp

Filesize
10.8MB

Download
memory/3124-65-0x00007FFCCA250000-0x00007FFCCAD11000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads