xworm | ed2412eaee0ed2a18411fda373dbf71a90296f5866aec5af55255a487b92af12

General

Target

wub_64.exe
Size

1.1MB
MD5

3fb29133bba5f76baf2a75d7b177e33c
SHA1

b5fce8752562db3bb24ca0c7f8c3c2da73098372
SHA256

ed2412eaee0ed2a18411fda373dbf71a90296f5866aec5af55255a487b92af12
SHA512

68170e31ba3ece0ee9294f0278bc2cf54be19cd73e80a9b78cc213f327464957f0fbee9aa16781791ed45e57cc107bd4825abc7661ab75df37546576c20cb243
SSDEEP

24576:a0euAl7t8FI3YcD7ODKlLo0cKiAwWxd19LW7bXH6sv:tNAl7tN39Hns0cjWxNLW7b36

Score

10^/10

xworm defense_evasion persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

vshostupdater.duckdns.org:34357

newport1179.duckdns.org:34357

windowsbre.duckdns.org:34357

Attributes

Install_directory
%AppData%
install_file
Windows Updater.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000d000000023b7f-16.dat	family_xworm
behavioral2/memory/4744-25-0x0000000000FE0000-0x0000000001000000-memory.dmp	family_xworm

Modifies security service 2 TTPs 1 IoCs

defense_evasion

Modify Registry

T1112

Windows Service

T1543.003

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wuauserv\Start = "4"	Wub_x64.exe

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

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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	wub_64.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	Wub64x.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Updater.lnk	Wub64x.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Updater.lnk	Wub64x.exe

Executes dropped EXE 4 IoCs

pid	Process
4628	Wub_x64.exe
4744	Wub64x.exe
2348	Windows Updater.exe
3320	Windows Updater.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-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Updater = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Updater.exe"	Wub64x.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
4900	schtasks.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4628	Wub_x64.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4744	Wub64x.exe
Token: SeDebugPrivilege	4744	Wub64x.exe
Token: SeDebugPrivilege	2348	Windows Updater.exe
Token: SeDebugPrivilege	3320	Windows Updater.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1604 wrote to memory of 4628	1604	wub_64.exe	83
PID 1604 wrote to memory of 4628	1604	wub_64.exe	83
PID 1604 wrote to memory of 4744	1604	wub_64.exe	84
PID 1604 wrote to memory of 4744	1604	wub_64.exe	84
PID 4744 wrote to memory of 4900	4744	Wub64x.exe	87
PID 4744 wrote to memory of 4900	4744	Wub64x.exe	87

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\wub_64.exe
"C:\Users\Admin\AppData\Local\Temp\wub_64.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1604
- C:\Users\Admin\AppData\Roaming\Wub_x64.exe
  "C:\Users\Admin\AppData\Roaming\Wub_x64.exe"
  2⤵
  - Modifies security service
  - Executes dropped EXE
  - Suspicious behavior: GetForegroundWindowSpam
  PID:4628
- C:\Users\Admin\AppData\Roaming\Wub64x.exe
  "C:\Users\Admin\AppData\Roaming\Wub64x.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4744
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Windows Updater" /tr "C:\Users\Admin\AppData\Roaming\Windows Updater.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4900

C:\Users\Admin\AppData\Roaming\Windows Updater.exe
"C:\Users\Admin\AppData\Roaming\Windows Updater.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2348

C:\Users\Admin\AppData\Roaming\Windows Updater.exe
"C:\Users\Admin\AppData\Roaming\Windows Updater.exe"
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3320

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

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

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

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\Windows Updater.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Local\Temp\4o6h2p8y.tmp

Filesize
18KB

MD5
e271af82f26e2ea669c08049c4367de3

SHA1
bc27b67df570f92c72e96068ac60ae543220af0a

SHA256
7cda69a9623825130dc5a0f4b19c383197c55a93664ee4f68c2e1d201c9741f6

SHA512
b0ea7d0d35ad84634c71669d81957610fbe8a347024b3b37b5d6705792faf14c60e43b4be17a486cb0e4c24271470746c3693194cc2c7f83a8ac20d9cd69138c

Download Submit
C:\Users\Admin\AppData\Roaming\Wub.ini

Filesize
5KB

MD5
f99194a662e8064dd845796e34305c10

SHA1
484b8a18b6b5e82118fdc8632f3574387ff0f356

SHA256
03de37da85b0912959ad3f6145778fa98a36d055d212d2e84a4ae71a28de7619

SHA512
775bb94a438b0455d6936cad346be282a8e90701560627f33c0be5df366e04b9cccd1cc3051fbb56353701d432e21e1eaf9f2ef1c48237867fa94fbae6bdc386

Download Submit
C:\Users\Admin\AppData\Roaming\Wub64x.exe

Filesize
110KB

MD5
16730f8a80733a2681eeb86f0f108d98

SHA1
e562451160d20e8f398f3610ef3d1dd3307c59fd

SHA256
065e6ef1d6194ff38440c85ee9dd326c9487016a041643015b90f6226ef6a911

SHA512
94e9d478e750164e1682f17d82e7b93ff42a5b9d7e56020f13a7529aca774c74d77ce71f5f7d084bbe61cee1bc50b1589ef0cc402506098a93d3e7140680fd18

Download Submit
C:\Users\Admin\AppData\Roaming\Wub_x64.exe

Filesize
939KB

MD5
9d6778f7f274f7ecd4e7e875a7268b64

SHA1
452fa439f1cc0b9fcc37cf4b8cfff96e8cc348aa

SHA256
187eeee9e518011de1b87cfb0ed03e12ea551e9011f0c8defdd0e4535e672da2

SHA512
d51df55a5f903ec624550e847459bfa52fb19e892a58fe2de41251d9d98890b36f26a4950ad75f900de0311b5330066aaece11ec5e549d5b3867a61a344e0b87

Download Submit
memory/1604-0-0x00007FFCC2293000-0x00007FFCC2295000-memory.dmp

Filesize
8KB

Download
memory/1604-1-0x0000000000A90000-0x0000000000BAA000-memory.dmp

Filesize
1.1MB

Download
memory/4744-25-0x0000000000FE0000-0x0000000001000000-memory.dmp

Filesize
128KB

Download
memory/4744-46-0x00007FFCC2290000-0x00007FFCC2D51000-memory.dmp

Filesize
10.8MB

Download
memory/4744-89-0x00007FFCC2290000-0x00007FFCC2D51000-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