xworm | 251eac0114f46e9f5ff05bfba18e27b9efc1845881829842d7ea655b717bcbd6

General

Target

gas.exe
Size

210KB
MD5

90c98d9fe169b720fe06cd53fbc60623
SHA1

b0bdcccd5977a95ba11b77907c1c02712c4bd044
SHA256

251eac0114f46e9f5ff05bfba18e27b9efc1845881829842d7ea655b717bcbd6
SHA512

6e1ff118479697b48884abb58b99457634305bd53b0a834d08806fc3daa16eedb9a2c6d8c76fcdbd52f6d2a4d9fcbf76a667030128f0ceb6eedd0ffb190b95ca
SSDEEP

3072:jDczFJ9ZTOC/h8SKfbzxcwg7es6/Vsb8VKTup49oJMfF/H9N3Ky9NzLnP:0RJ9vUhcX7elbKTuq9bfF/H9d9n

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

Mutex

Z8drePphw8vlIJAK

Attributes

Install_directory
%AppData%
install_file
XClient.exe
pastebin_url
https://pastebin.com/raw/4YfEusCJ

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/3244-1-0x00000000009A0000-0x00000000009DA000-memory.dmp	family_xworm
behavioral1/files/0x002000000002aab4-58.dat	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
1640	powershell.exe
1084	powershell.exe
4272	powershell.exe
4532	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
5096	XClient.exe
900	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-1-5-21-2584844841-1405471295-1760131749-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	gas.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 47 IoCs

Web Service

T1102

flow	ioc
32	pastebin.com
34	pastebin.com
36	pastebin.com
49	pastebin.com
3	pastebin.com
12	pastebin.com
43	pastebin.com
6	pastebin.com
31	pastebin.com
28	pastebin.com
29	pastebin.com
35	pastebin.com
45	pastebin.com
47	pastebin.com
4	pastebin.com
27	pastebin.com
11	pastebin.com
15	pastebin.com
17	pastebin.com
19	pastebin.com
23	pastebin.com
39	pastebin.com
5	pastebin.com
7	pastebin.com
22	pastebin.com
33	pastebin.com
37	pastebin.com
38	pastebin.com
40	pastebin.com
41	pastebin.com
8	pastebin.com
13	pastebin.com
46	pastebin.com
48	pastebin.com
1	pastebin.com
18	pastebin.com
21	pastebin.com
26	pastebin.com
42	pastebin.com
9	pastebin.com
16	pastebin.com
20	pastebin.com
24	pastebin.com
25	pastebin.com
44	pastebin.com
10	pastebin.com
14	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
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
4480	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4272	powershell.exe
4272	powershell.exe
4532	powershell.exe
4532	powershell.exe
1640	powershell.exe
1640	powershell.exe
1084	powershell.exe
1084	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	3244	gas.exe
Token: SeDebugPrivilege	4272	powershell.exe
Token: SeDebugPrivilege	4532	powershell.exe
Token: SeDebugPrivilege	1640	powershell.exe
Token: SeDebugPrivilege	1084	powershell.exe
Token: SeDebugPrivilege	5096	XClient.exe
Token: SeDebugPrivilege	900	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3244 wrote to memory of 4272	3244	gas.exe	78
PID 3244 wrote to memory of 4272	3244	gas.exe	78
PID 3244 wrote to memory of 4532	3244	gas.exe	80
PID 3244 wrote to memory of 4532	3244	gas.exe	80
PID 3244 wrote to memory of 1640	3244	gas.exe	82
PID 3244 wrote to memory of 1640	3244	gas.exe	82
PID 3244 wrote to memory of 1084	3244	gas.exe	84
PID 3244 wrote to memory of 1084	3244	gas.exe	84
PID 3244 wrote to memory of 4480	3244	gas.exe	86
PID 3244 wrote to memory of 4480	3244	gas.exe	86

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\gas.exe
"C:\Users\Admin\AppData\Local\Temp\gas.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3244
- 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\gas.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4272
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'gas.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4532
- 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'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1640
- 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:1084
- 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"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4480

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5096

C:\Users\Admin\AppData\Roaming\XClient.exe
C:\Users\Admin\AppData\Roaming\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:900

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\XClient.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
e47c3fa11e796c492a8388c946bf1636

SHA1
4a090378f0db26c6f019c9203f5b27f12fa865c7

SHA256
4bb861850395dcc3bec4691e8b9f0fa733b8a2d568d460a9201d65250b12fee1

SHA512
8d4af4eba3019cd060561f42cff11374eafe59da5e5ad677e41d0b9198b87d6d13706e760d13c70574ed1384993a1597f886d21fe6ecd0186379a1e93db30695

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

Filesize
944B

MD5
c309f1fc35f6fe4ac56de58892b22918

SHA1
0d43975439d2fbf02aa030474426f7370c6971c8

SHA256
b4a1191355a291991f79af07ad5705f778551b442c9a28466ebe1d9d79b257de

SHA512
503073b223e8c18fd0db2ecb79eff3b1c0803ae30b1ea58498b41c11c758338b7c0bb895a9b0b7862d2a17049e4477cd2ba0bd3550800e55cbdc5a3d32b2f1c9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_m5t31uwo.pwl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
210KB

MD5
90c98d9fe169b720fe06cd53fbc60623

SHA1
b0bdcccd5977a95ba11b77907c1c02712c4bd044

SHA256
251eac0114f46e9f5ff05bfba18e27b9efc1845881829842d7ea655b717bcbd6

SHA512
6e1ff118479697b48884abb58b99457634305bd53b0a834d08806fc3daa16eedb9a2c6d8c76fcdbd52f6d2a4d9fcbf76a667030128f0ceb6eedd0ffb190b95ca

Download Submit
memory/3244-1-0x00000000009A0000-0x00000000009DA000-memory.dmp

Filesize
232KB

Download
memory/3244-2-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/3244-0-0x00007FFE937C3000-0x00007FFE937C5000-memory.dmp

Filesize
8KB

Download
memory/3244-56-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/3244-30-0x00007FFE937C3000-0x00007FFE937C5000-memory.dmp

Filesize
8KB

Download
memory/4272-4-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/4272-19-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/4272-16-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/4272-15-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/4272-14-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download
memory/4272-13-0x0000028625120000-0x0000028625142000-memory.dmp

Filesize
136KB

Download
memory/4272-3-0x00007FFE937C0000-0x00007FFE94282000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads