xworm | c89a2ecf7b0776d2e7ee6974b11765a8e90e3ea4f903835053366954c4dbbe60

General

Target

script.ps1
Size

1KB
MD5

44b6f4aa8768e9628adb4f50961a6be2
SHA1

20964d7c8397c3a56821182fd6c1d426d2513fbe
SHA256

c89a2ecf7b0776d2e7ee6974b11765a8e90e3ea4f903835053366954c4dbbe60
SHA512

b69ce3f9f6fd0585936796862f51f309511400543285fc35eddcbec034612a511f84bbb8dac6f831ba44dea2dcd5a95e3ba483bf7fb4554b82192ccd36ebeccf

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Temp%
install_file
Chrome.exe
pastebin_url
https://pastebin.com/raw/H3wFXmEi

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0008000000023c7e-18.dat	family_xworm
behavioral2/memory/1980-29-0x0000000000620000-0x0000000000658000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Blocklisted process makes network request 1 IoCs

flow	pid	Process
7	4736	powershell.exe

Downloads MZ/PE file

Checks computer location settings 2 TTPs 1 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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	Chrome.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 4 IoCs

pid	Process
1980	Chrome.exe
2204	Chrome.exe
1708	Chrome.exe
440	Chrome.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-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Chrome = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Chrome.exe"	Chrome.exe

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

Web Service

T1102

flow	ioc
22	pastebin.com
21	pastebin.com

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
18	ip-api.com

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4736	powershell.exe

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
3628	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1980	Chrome.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
4736	powershell.exe
4736	powershell.exe
1980	Chrome.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4736	powershell.exe
Token: SeDebugPrivilege	1980	Chrome.exe
Token: SeDebugPrivilege	1980	Chrome.exe
Token: SeDebugPrivilege	2204	Chrome.exe
Token: SeDebugPrivilege	1708	Chrome.exe
Token: SeDebugPrivilege	440	Chrome.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1980	Chrome.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4736 wrote to memory of 1980	4736	powershell.exe	84
PID 4736 wrote to memory of 1980	4736	powershell.exe	84
PID 1980 wrote to memory of 3628	1980	Chrome.exe	92
PID 1980 wrote to memory of 3628	1980	Chrome.exe	92

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:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\script.ps1
1⤵
- Blocklisted process makes network request
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4736
- C:\Users\Admin\Downloads\Chrome.exe
  "C:\Users\Admin\Downloads\Chrome.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1980
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Chrome" /tr "C:\Users\Admin\AppData\Local\Temp\Chrome.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3628

C:\Users\Admin\AppData\Local\Temp\Chrome.exe
C:\Users\Admin\AppData\Local\Temp\Chrome.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2204

C:\Users\Admin\AppData\Local\Temp\Chrome.exe
C:\Users\Admin\AppData\Local\Temp\Chrome.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1708

C:\Users\Admin\AppData\Local\Temp\Chrome.exe
C:\Users\Admin\AppData\Local\Temp\Chrome.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:440

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bfdmklv1.wvw.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\Downloads\Chrome.exe

Filesize
197KB

MD5
f956d04fc1f44a110400e8aaf76fa48b

SHA1
8c8e7b049e81058dda63facc0aeb790f670be99e

SHA256
e413b898bcf92f62736144346100f00a74904a13d94cfe4d2aef5aca31e1154e

SHA512
95e5ca134e3479bde58a08567935ef8159b20dde7157bfeb81c23929ae7a89a15e699e1764c7dcea4d23cd254d27759f70af5c6b7e21c9d3358f9b4019539224

Download Submit
memory/1980-29-0x0000000000620000-0x0000000000658000-memory.dmp

Filesize
224KB

Download
memory/1980-27-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/1980-30-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/1980-35-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/4736-12-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/4736-13-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/4736-11-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/4736-28-0x00007FFB768C0000-0x00007FFB77381000-memory.dmp

Filesize
10.8MB

Download
memory/4736-0-0x00007FFB768C3000-0x00007FFB768C5000-memory.dmp

Filesize
8KB

Download
memory/4736-1-0x000002BFB90E0000-0x000002BFB9102000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads