xworm | 8641f88b89c9076ece3ee571baa4b3c93ba3ac3883e90fe5f894dc41e3b7bdc7

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 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 3 IoCs

resource	yara_rule
behavioral5/memory/2256-0-0x00000000000E0000-0x00000000000F8000-memory.dmp	family_xworm
behavioral5/files/0x000d000000015cff-32.dat	family_xworm
behavioral5/memory/2140-34-0x0000000001350000-0x0000000001368000-memory.dmp	family_xworm

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

Executes dropped EXE 2 IoCs

pid	Process
2140	svchost.exe
1244	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-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Public\\svchost.exe"	loader-upd.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 9 IoCs

Web Service

T1102

flow	ioc
13	pastebin.com
4	pastebin.com
6	pastebin.com
7	pastebin.com
9	pastebin.com
11	pastebin.com
12	pastebin.com
8	pastebin.com
10	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
804	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2928	powershell.exe
2400	powershell.exe
2560	powershell.exe
2452	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	2256	loader-upd.exe
Token: SeDebugPrivilege	2928	powershell.exe
Token: SeDebugPrivilege	2400	powershell.exe
Token: SeDebugPrivilege	2560	powershell.exe
Token: SeDebugPrivilege	2452	powershell.exe
Token: SeDebugPrivilege	2140	svchost.exe
Token: SeDebugPrivilege	1244	svchost.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2256 wrote to memory of 2928	2256	loader-upd.exe	28
PID 2256 wrote to memory of 2928	2256	loader-upd.exe	28
PID 2256 wrote to memory of 2928	2256	loader-upd.exe	28
PID 2256 wrote to memory of 2400	2256	loader-upd.exe	30
PID 2256 wrote to memory of 2400	2256	loader-upd.exe	30
PID 2256 wrote to memory of 2400	2256	loader-upd.exe	30
PID 2256 wrote to memory of 2560	2256	loader-upd.exe	32
PID 2256 wrote to memory of 2560	2256	loader-upd.exe	32
PID 2256 wrote to memory of 2560	2256	loader-upd.exe	32
PID 2256 wrote to memory of 2452	2256	loader-upd.exe	34
PID 2256 wrote to memory of 2452	2256	loader-upd.exe	34
PID 2256 wrote to memory of 2452	2256	loader-upd.exe	34
PID 2256 wrote to memory of 804	2256	loader-upd.exe	36
PID 2256 wrote to memory of 804	2256	loader-upd.exe	36
PID 2256 wrote to memory of 804	2256	loader-upd.exe	36
PID 1260 wrote to memory of 2140	1260	taskeng.exe	41
PID 1260 wrote to memory of 2140	1260	taskeng.exe	41
PID 1260 wrote to memory of 2140	1260	taskeng.exe	41
PID 1260 wrote to memory of 1244	1260	taskeng.exe	42
PID 1260 wrote to memory of 1244	1260	taskeng.exe	42
PID 1260 wrote to memory of 1244	1260	taskeng.exe	42

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 use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2256
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2928
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2400
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2560
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2452
- 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:804

C:\Windows\system32\taskeng.exe
taskeng.exe {F4130778-963B-4957-BC5C-22E16DE2BE70} S-1-5-21-3452737119-3959686427-228443150-1000:QGTQZTRE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1260
- C:\Users\Public\svchost.exe
  C:\Users\Public\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2140
- C:\Users\Public\svchost.exe
  C:\Users\Public\svchost.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1244

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
7KB

MD5
fe65250173fd7207ea6a583e3ca384ed

SHA1
10bc08fb8efe198b892cd6dee12f0311a74fab2c

SHA256
ba44f2e39ddc3a7ee7eaa93fc2b927d337ab5ef8dd613f883fe75e2a2c0ac4f1

SHA512
668d4716bdeaf6c52a6397186b54ea1d6e9530be52fce3325bc0485d0e12364bb76cefa5bbab32e5102b0c08ed339a1662645db64ef2b697f05214c40c11a135

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

Filesize
70KB

MD5
573bd20fc8382d92a7ae9eae51e738e3

SHA1
55006093429df791f27e91a66e5ee63a81382b28

SHA256
09036ffa342f9e5bb1e31a867dcc3b60db011baba8c0d202aff1d33195cbe729

SHA512
d38736acff4128d6ce9ea17ee609ca33a37ac88f2c994cf4caf7f0eb62406a8963c33531b9f3cd020974d892c2751f3a4f67ce13ed6ba6080f97c406ccbb4aca

Download Submit
memory/2140-34-0x0000000001350000-0x0000000001368000-memory.dmp

Filesize
96KB

Download
memory/2256-28-0x000000001AB20000-0x000000001ABA0000-memory.dmp

Filesize
512KB

Download
memory/2256-1-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Filesize
9.9MB

Download
memory/2256-30-0x000000001AB20000-0x000000001ABA0000-memory.dmp

Filesize
512KB

Download
memory/2256-0-0x00000000000E0000-0x00000000000F8000-memory.dmp

Filesize
96KB

Download
memory/2256-29-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Filesize
9.9MB

Download
memory/2400-14-0x000000001B570000-0x000000001B852000-memory.dmp

Filesize
2.9MB

Download
memory/2400-15-0x00000000022D0000-0x00000000022D8000-memory.dmp

Filesize
32KB

Download
memory/2928-8-0x00000000029E0000-0x00000000029E8000-memory.dmp

Filesize
32KB

Download
memory/2928-7-0x000000001B500000-0x000000001B7E2000-memory.dmp

Filesize
2.9MB

Download
memory/2928-6-0x0000000002DB0000-0x0000000002E30000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads