xworm | 8641f88b89c9076ece3ee571baa4b3c93ba3ac3883e90fe5f894dc41e3b7bdc7

Analysis

max time kernel
121s
max time network
131s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
02-05-2024 18:50

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General

Target

Ro-exec/loader-upd.exe
Size

70KB
MD5

573bd20fc8382d92a7ae9eae51e738e3
SHA1

55006093429df791f27e91a66e5ee63a81382b28
SHA256

09036ffa342f9e5bb1e31a867dcc3b60db011baba8c0d202aff1d33195cbe729
SHA512

d38736acff4128d6ce9ea17ee609ca33a37ac88f2c994cf4caf7f0eb62406a8963c33531b9f3cd020974d892c2751f3a4f67ce13ed6ba6080f97c406ccbb4aca
SSDEEP

1536:PmMfwrNATngx6fPLgD9vYebv2S5NiwWW6N9dOoihkAO:LCmn463UD6ebv242FzOoiSAO

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%Public%
install_file
svchost.exe
pastebin_url
https://pastebin.com/raw/UWpQULMP

Signatures

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral5/memory/2748-1-0x0000000000270000-0x0000000000288000-memory.dmp	family_xworm
behavioral5/files/0x000e000000013113-46.dat	family_xworm
behavioral5/memory/860-48-0x00000000010D0000-0x00000000010E8000-memory.dmp	family_xworm
behavioral5/memory/1368-50-0x00000000000E0000-0x00000000000F8000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
3060	powershell.exe
2664	powershell.exe
2740	powershell.exe
2532	powershell.exe

Deletes itself 1 IoCs

pid	Process
300	cmd.exe

Executes dropped EXE 2 IoCs

pid	Process
860	svchost.exe
1368	svchost.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-1-5-21-3627615824-4061627003-3019543961-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Public\\svchost.exe"	loader-upd.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
4	pastebin.com
5	pastebin.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
1924	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1644	timeout.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2748	loader-upd.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3060	powershell.exe
2664	powershell.exe
2740	powershell.exe
2532	powershell.exe
2748	loader-upd.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	2748	loader-upd.exe
Token: SeDebugPrivilege	3060	powershell.exe
Token: SeDebugPrivilege	2664	powershell.exe
Token: SeDebugPrivilege	2740	powershell.exe
Token: SeDebugPrivilege	2532	powershell.exe
Token: SeDebugPrivilege	2748	loader-upd.exe
Token: SeDebugPrivilege	860	svchost.exe
Token: SeDebugPrivilege	1368	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2748	loader-upd.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2748 wrote to memory of 3060	2748	loader-upd.exe	28
PID 2748 wrote to memory of 3060	2748	loader-upd.exe	28
PID 2748 wrote to memory of 3060	2748	loader-upd.exe	28
PID 2748 wrote to memory of 2664	2748	loader-upd.exe	30
PID 2748 wrote to memory of 2664	2748	loader-upd.exe	30
PID 2748 wrote to memory of 2664	2748	loader-upd.exe	30
PID 2748 wrote to memory of 2740	2748	loader-upd.exe	32
PID 2748 wrote to memory of 2740	2748	loader-upd.exe	32
PID 2748 wrote to memory of 2740	2748	loader-upd.exe	32
PID 2748 wrote to memory of 2532	2748	loader-upd.exe	34
PID 2748 wrote to memory of 2532	2748	loader-upd.exe	34
PID 2748 wrote to memory of 2532	2748	loader-upd.exe	34
PID 2748 wrote to memory of 1924	2748	loader-upd.exe	36
PID 2748 wrote to memory of 1924	2748	loader-upd.exe	36
PID 2748 wrote to memory of 1924	2748	loader-upd.exe	36
PID 1328 wrote to memory of 860	1328	taskeng.exe	40
PID 1328 wrote to memory of 860	1328	taskeng.exe	40
PID 1328 wrote to memory of 860	1328	taskeng.exe	40
PID 1328 wrote to memory of 1368	1328	taskeng.exe	43
PID 1328 wrote to memory of 1368	1328	taskeng.exe	43
PID 1328 wrote to memory of 1368	1328	taskeng.exe	43
PID 2748 wrote to memory of 768	2748	loader-upd.exe	44
PID 2748 wrote to memory of 768	2748	loader-upd.exe	44
PID 2748 wrote to memory of 768	2748	loader-upd.exe	44
PID 2748 wrote to memory of 300	2748	loader-upd.exe	46
PID 2748 wrote to memory of 300	2748	loader-upd.exe	46
PID 2748 wrote to memory of 300	2748	loader-upd.exe	46
PID 300 wrote to memory of 1644	300	cmd.exe	48
PID 300 wrote to memory of 1644	300	cmd.exe	48
PID 300 wrote to memory of 1644	300	cmd.exe	48

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\Ro-exec\loader-upd.exe
"C:\Users\Admin\AppData\Local\Temp\Ro-exec\loader-upd.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2748
- 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\Ro-exec\loader-upd.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3060
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'loader-upd.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2664
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2740
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2532
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Public\svchost.exe"
  2⤵
  - Creates scheduled task(s)
  PID:1924
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /delete /f /tn "svchost"
  2⤵
  PID:768
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpD30A.tmp.bat""
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:300
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1644

C:\Windows\system32\taskeng.exe
taskeng.exe {6B5989AF-4208-4265-B6BB-2BFD8AB0CD7F} S-1-5-21-3627615824-4061627003-3019543961-1000:SCFGBRBT\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1328
- C:\Users\Public\svchost.exe
  C:\Users\Public\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:860
- C:\Users\Public\svchost.exe
  C:\Users\Public\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD30A.tmp.bat

Filesize
170B

MD5
7ccecbb9378d1cbdc3412cbe1e6a8173

SHA1
ec8652db73c7b43bce3beae5032ff94f939d2ffc

SHA256
b59ea588c069f714462d1665c96d5ce08be9fc03e32a7ba07962a82baa49708b

SHA512
65f4216c76ec42e0c2697ff6b57538c6957a68a47feb6597b8d3d1748c63899780baf36cd30f83df8e59029b466c8a8857b50450cf4bbced81b788c7cd2414d9

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
c3f0a39efcc8baa6ff8ea91bced0624d

SHA1
e2c3b8ff391ff28c1b3fe7b3e4d234532e91c932

SHA256
ce239074c84428fa6c5b9bb0af48f1f2c166f16d26df2805cf2c352c90cbd144

SHA512
c4562856c9fa900081d2969900b270faa5028258b7179f262e271bc0b2d3a0c5d03518c90a649d1b6afca0a34fcff8af6060561c4c5f6406fab5cf54e30dc39c

Download Submit
C:\Users\Public\svchost.exe

Filesize
70KB

MD5
573bd20fc8382d92a7ae9eae51e738e3

SHA1
55006093429df791f27e91a66e5ee63a81382b28

SHA256
09036ffa342f9e5bb1e31a867dcc3b60db011baba8c0d202aff1d33195cbe729

SHA512
d38736acff4128d6ce9ea17ee609ca33a37ac88f2c994cf4caf7f0eb62406a8963c33531b9f3cd020974d892c2751f3a4f67ce13ed6ba6080f97c406ccbb4aca

Download Submit
memory/860-48-0x00000000010D0000-0x00000000010E8000-memory.dmp

Filesize
96KB

Download
memory/1368-50-0x00000000000E0000-0x00000000000F8000-memory.dmp

Filesize
96KB

Download
memory/2664-14-0x000000001B770000-0x000000001BA52000-memory.dmp

Filesize
2.9MB

Download
memory/2664-15-0x0000000001F60000-0x0000000001F68000-memory.dmp

Filesize
32KB

Download
memory/2748-0-0x000007FEF5783000-0x000007FEF5784000-memory.dmp

Filesize
4KB

Download
memory/2748-28-0x000000001B120000-0x000000001B1A0000-memory.dmp

Filesize
512KB

Download
memory/2748-43-0x000007FEF5783000-0x000007FEF5784000-memory.dmp

Filesize
4KB

Download
memory/2748-44-0x000000001B120000-0x000000001B1A0000-memory.dmp

Filesize
512KB

Download
memory/2748-1-0x0000000000270000-0x0000000000288000-memory.dmp

Filesize
96KB

Download
memory/3060-8-0x0000000002990000-0x0000000002998000-memory.dmp

Filesize
32KB

Download
memory/3060-7-0x000000001B510000-0x000000001B7F2000-memory.dmp

Filesize
2.9MB

Download
memory/3060-6-0x0000000002D30000-0x0000000002DB0000-memory.dmp

Filesize
512KB

Download