xworm | 739dcb8887532e966ae7e49e95de28b9f89e342d5ac8ab4a6fc66163a6ec656a

General

Target

XClient.exe
Size

41KB
MD5

f39bdd2e04dd6485c35843cfb7ed5328
SHA1

12613c804847302eaf51d248125bf567d6e0fc81
SHA256

739dcb8887532e966ae7e49e95de28b9f89e342d5ac8ab4a6fc66163a6ec656a
SHA512

ff0ab2cab30d784c429f614915d6e90623ba4e07952052263d3d64abe5b19a462f0dbfee57c13a19f258828bf0a18011f5e8154f0cc655275303a186114d8664
SSDEEP

768:myIOKKVKWC6+3XvgggCLJF5PG9pm96vOwhv3Emz/:mzbKVKWLoXvvgcFI9A96vOwN9z

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

tcp://ikonik2681-35277.portmap.host:35277

Mutex

vlO7QJJcLCTXEz3h

Attributes

Install_directory
%AppData%
install_file
$77MicrosoftDefender.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/1804-1-0x0000000000CB0000-0x0000000000CC0000-memory.dmp	family_xworm
behavioral2/files/0x000b000000023cc3-59.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
3476	powershell.exe
4568	powershell.exe
3016	powershell.exe
4668	powershell.exe

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-1-5-21-493223053-2004649691-1575712786-1000\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\$77MicrosoftDefender.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77MicrosoftDefender.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
1904	$77MicrosoftDefender.exe
1384	$77MicrosoftDefender.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-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\$77MicrosoftDefender = "C:\\Users\\Admin\\AppData\\Roaming\\$77MicrosoftDefender.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
15	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
220	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3476	powershell.exe
3476	powershell.exe
4568	powershell.exe
4568	powershell.exe
3016	powershell.exe
3016	powershell.exe
4668	powershell.exe
4668	powershell.exe
1804	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	1804	XClient.exe
Token: SeDebugPrivilege	3476	powershell.exe
Token: SeDebugPrivilege	4568	powershell.exe
Token: SeDebugPrivilege	3016	powershell.exe
Token: SeDebugPrivilege	4668	powershell.exe
Token: SeDebugPrivilege	1804	XClient.exe
Token: SeDebugPrivilege	1904	$77MicrosoftDefender.exe
Token: SeDebugPrivilege	1384	$77MicrosoftDefender.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1804	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1804 wrote to memory of 3476	1804	XClient.exe	91
PID 1804 wrote to memory of 3476	1804	XClient.exe	91
PID 1804 wrote to memory of 4568	1804	XClient.exe	95
PID 1804 wrote to memory of 4568	1804	XClient.exe	95
PID 1804 wrote to memory of 3016	1804	XClient.exe	97
PID 1804 wrote to memory of 3016	1804	XClient.exe	97
PID 1804 wrote to memory of 4668	1804	XClient.exe	99
PID 1804 wrote to memory of 4668	1804	XClient.exe	99
PID 1804 wrote to memory of 220	1804	XClient.exe	103
PID 1804 wrote to memory of 220	1804	XClient.exe	103

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⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1804
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3476
- 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:4568
- 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\$77MicrosoftDefender.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3016
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '$77MicrosoftDefender.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4668
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "$77MicrosoftDefender" /tr "C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:220

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1904

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1384

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

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\$77MicrosoftDefender.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
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
944B

MD5
22310ad6749d8cc38284aa616efcd100

SHA1
440ef4a0a53bfa7c83fe84326a1dff4326dcb515

SHA256
55b1d8021c4eb4c3c0d75e3ed7a4eb30cd0123e3d69f32eeb596fe4ffec05abf

SHA512
2ef08e2ee15bb86695fe0c10533014ffed76ececc6e579d299d3365fafb7627f53e32e600bb6d872b9f58aca94f8cb7e1e94cdfd14777527f7f0aa019d9c6def

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

Filesize
944B

MD5
15dde0683cd1ca19785d7262f554ba93

SHA1
d039c577e438546d10ac64837b05da480d06bf69

SHA256
d6fa39eab7ee36f44dc3f9f2839d098433db95c1eba924e4bcf4e5c0d268d961

SHA512
57c0e1b87bc1c136f0d39f3ce64bb8f8274a0491e4ca6e45e5c7f9070aa9d9370c6f590ce37cd600b252df2638d870205249a514c43245ca7ed49017024a4672

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_jyax00ka.ei4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe

Filesize
41KB

MD5
f39bdd2e04dd6485c35843cfb7ed5328

SHA1
12613c804847302eaf51d248125bf567d6e0fc81

SHA256
739dcb8887532e966ae7e49e95de28b9f89e342d5ac8ab4a6fc66163a6ec656a

SHA512
ff0ab2cab30d784c429f614915d6e90623ba4e07952052263d3d64abe5b19a462f0dbfee57c13a19f258828bf0a18011f5e8154f0cc655275303a186114d8664

Download Submit
memory/1804-0-0x00007FFC0F873000-0x00007FFC0F875000-memory.dmp

Filesize
8KB

Download
memory/1804-2-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/1804-57-0x00007FFC0F873000-0x00007FFC0F875000-memory.dmp

Filesize
8KB

Download
memory/1804-58-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/1804-1-0x0000000000CB0000-0x0000000000CC0000-memory.dmp

Filesize
64KB

Download
memory/3476-14-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/3476-15-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/3476-18-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/3476-13-0x00007FFC0F870000-0x00007FFC10331000-memory.dmp

Filesize
10.8MB

Download
memory/3476-8-0x000001E37DFE0000-0x000001E37E002000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads