xworm | c150b18ea2bd00902f2b8de9b0439ef6bd2a448b3255ac4619bab7de57407ea3

General

Target

XClient.exe
Size

41KB
MD5

486527e2986049735316f190c8571c72
SHA1

9ce5e9ae89d3b91c834ac66d5ab947687b867c19
SHA256

c150b18ea2bd00902f2b8de9b0439ef6bd2a448b3255ac4619bab7de57407ea3
SHA512

01ed720a7100238bb51e1fa6ebe88e62a3fa6c3060c472891c38b0cfc17e29d4f11899a0dd12d3460473f751af299a5e5c87e97a2a75b0c7e911b5797f13c745
SSDEEP

768:bG2ZOWZ42nxuT3XvgggCLJF5PG9pmWJ6vOwhX3Emz9:bG2bZ42n07XvvgcFI9AWJ6vOwV9Z

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

ikonik2681-35277.portmap.host:35277

Mutex

NwRz6E7beRbMfRwa

Attributes

Install_directory
%AppData%
install_file
$77MicrosoftDefender.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/1408-1-0x00000000007D0000-0x00000000007E0000-memory.dmp	family_xworm
behavioral2/files/0x000e000000023b7b-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
1220	powershell.exe
4052	powershell.exe
2072	powershell.exe
1952	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 3 IoCs

pid	Process
4628	$77MicrosoftDefender.exe
3320	$77MicrosoftDefender.exe
1924	$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
4796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1220	powershell.exe
1220	powershell.exe
4052	powershell.exe
4052	powershell.exe
2072	powershell.exe
2072	powershell.exe
1952	powershell.exe
1952	powershell.exe
1408	XClient.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	1408	XClient.exe
Token: SeDebugPrivilege	1220	powershell.exe
Token: SeDebugPrivilege	4052	powershell.exe
Token: SeDebugPrivilege	2072	powershell.exe
Token: SeDebugPrivilege	1952	powershell.exe
Token: SeDebugPrivilege	1408	XClient.exe
Token: SeDebugPrivilege	4628	$77MicrosoftDefender.exe
Token: SeDebugPrivilege	3320	$77MicrosoftDefender.exe
Token: SeDebugPrivilege	1924	$77MicrosoftDefender.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1408	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1408 wrote to memory of 1220	1408	XClient.exe	89
PID 1408 wrote to memory of 1220	1408	XClient.exe	89
PID 1408 wrote to memory of 4052	1408	XClient.exe	91
PID 1408 wrote to memory of 4052	1408	XClient.exe	91
PID 1408 wrote to memory of 2072	1408	XClient.exe	95
PID 1408 wrote to memory of 2072	1408	XClient.exe	95
PID 1408 wrote to memory of 1952	1408	XClient.exe	97
PID 1408 wrote to memory of 1952	1408	XClient.exe	97
PID 1408 wrote to memory of 4796	1408	XClient.exe	99
PID 1408 wrote to memory of 4796	1408	XClient.exe	99

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:1408
- 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:1220
- 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:4052
- 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:2072
- 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:1952
- 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:4796

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4628

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3320

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1924

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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
944B

MD5
07d1ad01cd25da1dd220dfd09e7d7ece

SHA1
ff11be9646bdc6334f7b7af7ded270952cc057b1

SHA256
aad6ca93c9d165063bdd3cbe2f022118c3d1cb1330560a1746619ab253d5db4a

SHA512
8854dd65ee9f4594c06bde7382bddc853e63e1f45818c2c7e23e339d9b65616cbcb69b9b6d2b878de2d24362194f543a36b64815abd087135b50c9cab2631f95

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

Filesize
944B

MD5
04f1d68afbed6b13399edfae1e9b1472

SHA1
8bfdcb687a995e4a63a8c32df2c66dc89f91a8b0

SHA256
f358f33a42122e97c489fad7bbc8beab2eb42d42e4ec7fce0dd61fe6d8c0b8de

SHA512
30c5e72a8134992094d937d2588f7a503b1d6407d11afe0265b7c8b0ce14071925e5caed13fc4f9c28705df4c7aed3601f81b007048b148af274d7784aa5fb75

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_y5pinfij.cl0.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
41KB

MD5
486527e2986049735316f190c8571c72

SHA1
9ce5e9ae89d3b91c834ac66d5ab947687b867c19

SHA256
c150b18ea2bd00902f2b8de9b0439ef6bd2a448b3255ac4619bab7de57407ea3

SHA512
01ed720a7100238bb51e1fa6ebe88e62a3fa6c3060c472891c38b0cfc17e29d4f11899a0dd12d3460473f751af299a5e5c87e97a2a75b0c7e911b5797f13c745

Download Submit
memory/1220-9-0x000001981BF40000-0x000001981BF62000-memory.dmp

Filesize
136KB

Download
memory/1220-18-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

Filesize
10.8MB

Download
memory/1220-15-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

Filesize
10.8MB

Download
memory/1220-14-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

Filesize
10.8MB

Download
memory/1220-3-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

Filesize
10.8MB

Download
memory/1408-0-0x00007FFB42CD3000-0x00007FFB42CD5000-memory.dmp

Filesize
8KB

Download
memory/1408-57-0x00007FFB42CD3000-0x00007FFB42CD5000-memory.dmp

Filesize
8KB

Download
memory/1408-58-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

Filesize
10.8MB

Download
memory/1408-2-0x00007FFB42CD0000-0x00007FFB43791000-memory.dmp

Filesize
10.8MB

Download
memory/1408-1-0x00000000007D0000-0x00000000007E0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads