xworm | 5eff5c5de41bfde202b7f8c545330b42a3b6b3b51df8abd66c06823a0404d9e6

General

Target

XClient.exe
Size

69KB
MD5

4f035ef4de3102e56d73a1e5bc0133ce
SHA1

f9a6464bec36e6171ca140fb0b9ba97a9dab6afe
SHA256

5eff5c5de41bfde202b7f8c545330b42a3b6b3b51df8abd66c06823a0404d9e6
SHA512

e3235deaf69c9b806b0df6d17cdd6987ceb25e96ee51358173e8c836eff06ab8637eab07b49b3b323c5d6b97b8a194d176f5dff3a131cebe74176b39e5fd1dec
SSDEEP

1536:R1TbxvCM8IIEQlpGzFt6LnXvb32CxMyLMUv12tOsVyCMnV:jTlB8IxcpGJt6zfb3221v12tOsVyjV

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

3.1

C2

193.161.193.99 :44548

Attributes

Install_directory
%ProgramData%
install_file
USB.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral3/memory/3108-1-0x0000000000070000-0x0000000000088000-memory.dmp	family_xworm
behavioral3/files/0x000800000002a9ac-9.dat	family_xworm

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

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
2304	XClient.exe
332	XClient.exe
4984	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-1-5-21-3062789476-783164490-2318012559-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\ProgramData\\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
1	ip-api.com

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
4400	schtasks.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3108	XClient.exe
Token: SeDebugPrivilege	2304	XClient.exe
Token: SeDebugPrivilege	332	XClient.exe
Token: SeDebugPrivilege	4984	XClient.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3108 wrote to memory of 4400	3108	XClient.exe	79
PID 3108 wrote to memory of 4400	3108	XClient.exe	79

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.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3108
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "XClient" /tr "C:\ProgramData\XClient.exe"
  2⤵
  - Creates scheduled task(s)
  PID:4400

C:\ProgramData\XClient.exe
C:\ProgramData\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2304

C:\ProgramData\XClient.exe
C:\ProgramData\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:332

C:\ProgramData\XClient.exe
C:\ProgramData\XClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4984

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

1

T1112

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:\ProgramData\XClient.exe

Filesize
69KB

MD5
4f035ef4de3102e56d73a1e5bc0133ce

SHA1
f9a6464bec36e6171ca140fb0b9ba97a9dab6afe

SHA256
5eff5c5de41bfde202b7f8c545330b42a3b6b3b51df8abd66c06823a0404d9e6

SHA512
e3235deaf69c9b806b0df6d17cdd6987ceb25e96ee51358173e8c836eff06ab8637eab07b49b3b323c5d6b97b8a194d176f5dff3a131cebe74176b39e5fd1dec

Download Submit
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
memory/2304-13-0x00007FFF1DEB0000-0x00007FFF1E972000-memory.dmp

Filesize
10.8MB

Download
memory/2304-15-0x00007FFF1DEB0000-0x00007FFF1E972000-memory.dmp

Filesize
10.8MB

Download
memory/3108-0-0x00007FFF1DEB3000-0x00007FFF1DEB5000-memory.dmp

Filesize
8KB

Download
memory/3108-1-0x0000000000070000-0x0000000000088000-memory.dmp

Filesize
96KB

Download
memory/3108-2-0x00007FFF1DEB0000-0x00007FFF1E972000-memory.dmp

Filesize
10.8MB

Download
memory/3108-16-0x00007FFF1DEB0000-0x00007FFF1E972000-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