Malware Analysis Report

2024-11-16 13:33

Sample ID 240527-mb2r5sgc3s
Target sem.exe
SHA256 ccf87c21e3783012b150a710bf7007ea3aac1b3cb6d2855a1fd78b40f0175da9
Tags
xworm execution persistence rat trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

ccf87c21e3783012b150a710bf7007ea3aac1b3cb6d2855a1fd78b40f0175da9

Threat Level: Known bad

The file sem.exe was found to be: Known bad.

Malicious Activity Summary

xworm execution persistence rat trojan

Detect Xworm Payload

Xworm family

Xworm

Command and Scripting Interpreter: PowerShell

Executes dropped EXE

Checks computer location settings

Drops startup file

Adds Run key to start application

Unsigned PE

Enumerates physical storage devices

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-27 10:18

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A

Xworm family

xworm

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-27 10:18

Reported

2024-05-27 10:20

Platform

win7-20240508-en

Max time kernel

145s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\sem.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Xworm

trojan rat xworm

Drops startup file

Description Indicator Process Target
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sys.lnk C:\Users\Admin\AppData\Local\Temp\sem.exe N/A
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sys.lnk C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-268080393-3149932598-1824759070-1000\Software\Microsoft\Windows\CurrentVersion\Run\sys = "C:\\Users\\Admin\\AppData\\Roaming\\sys.exe" C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\sem.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\sem.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3000 wrote to memory of 3068 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 3068 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 3068 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2664 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2664 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2664 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2820 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2820 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2820 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2688 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2688 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2688 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 3000 wrote to memory of 2992 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\schtasks.exe
PID 3000 wrote to memory of 2992 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\schtasks.exe
PID 3000 wrote to memory of 2992 N/A C:\Users\Admin\AppData\Local\Temp\sem.exe C:\Windows\System32\schtasks.exe
PID 2748 wrote to memory of 2720 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\sys.exe
PID 2748 wrote to memory of 2720 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\sys.exe
PID 2748 wrote to memory of 2720 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\sys.exe
PID 2748 wrote to memory of 1972 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\sys.exe
PID 2748 wrote to memory of 1972 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\sys.exe
PID 2748 wrote to memory of 1972 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Roaming\sys.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\sem.exe

"C:\Users\Admin\AppData\Local\Temp\sem.exe"

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\sem.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'sem.exe'

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\sys.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'sys.exe'

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "sys" /tr "C:\Users\Admin\AppData\Roaming\sys.exe"

C:\Windows\system32\taskeng.exe

taskeng.exe {55999861-B192-4254-9BB5-AA81D236EFB2} S-1-5-21-268080393-3149932598-1824759070-1000:UHRQKJCP\Admin:Interactive:[1]

C:\Users\Admin\AppData\Roaming\sys.exe

C:\Users\Admin\AppData\Roaming\sys.exe

C:\Users\Admin\AppData\Roaming\sys.exe

C:\Users\Admin\AppData\Roaming\sys.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 sent-down.gl.at.ply.gg udp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp

Files

memory/3000-0-0x000007FEF5373000-0x000007FEF5374000-memory.dmp

memory/3000-1-0x0000000000890000-0x00000000008AA000-memory.dmp

memory/3068-6-0x0000000002CA0000-0x0000000002D20000-memory.dmp

memory/3068-7-0x000000001B660000-0x000000001B942000-memory.dmp

memory/3068-8-0x0000000001E80000-0x0000000001E88000-memory.dmp

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

MD5 9dc73c7c534b2da26c940f5a6683ac43
SHA1 50ef585af35a3ee4f88d1c6c96440be307bf411c
SHA256 51d18eab2f1207bf2ac6a28288f1dc897796163e00ea7381d3e1a14e5adc35c1
SHA512 b06e05887c24317b5b6e6fbfea05d8137699d346cf49a935cffb12cd423015b859154fca74dd449bb453704632d809f1adf8e0715cd85eee9ba7ae4c9e002637

memory/2664-14-0x000000001B760000-0x000000001BA42000-memory.dmp

memory/2664-15-0x0000000001E10000-0x0000000001E18000-memory.dmp

\??\PIPE\srvsvc

MD5 d41d8cd98f00b204e9800998ecf8427e
SHA1 da39a3ee5e6b4b0d3255bfef95601890afd80709
SHA256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
SHA512 cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

memory/3000-31-0x0000000000430000-0x00000000004B0000-memory.dmp

memory/3000-32-0x000007FEF5373000-0x000007FEF5374000-memory.dmp

memory/3000-33-0x0000000000430000-0x00000000004B0000-memory.dmp

C:\Users\Admin\AppData\Roaming\sys.exe

MD5 15966aaa6973e8710c21dbb9d232a5f2
SHA1 99436fb15633ea4331872cacdcbde492df30dda1
SHA256 ccf87c21e3783012b150a710bf7007ea3aac1b3cb6d2855a1fd78b40f0175da9
SHA512 f35926607346f3472268a3c4f3106a929470211d47bd58230ac3e432208af204e4350a56fe7ec80865fbe80809c32a034cf356ce4db96fb57be6e9cf55da85fd

memory/2720-37-0x0000000000E20000-0x0000000000E3A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-27 10:18

Reported

2024-05-27 10:20

Platform

win10v2004-20240508-en

Max time kernel

134s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\sem.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Xworm

trojan rat xworm

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sys.lnk C:\Users\Admin\AppData\Local\Temp\sem.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sys.lnk C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sys = "C:\\Users\\Admin\\AppData\\Roaming\\sys.exe" C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\sem.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\sem.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\sys.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\sem.exe N/A

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\sem.exe

"C:\Users\Admin\AppData\Local\Temp\sem.exe"

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\sem.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'sem.exe'

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\sys.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'sys.exe'

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "sys" /tr "C:\Users\Admin\AppData\Roaming\sys.exe"

C:\Users\Admin\AppData\Roaming\sys.exe

C:\Users\Admin\AppData\Roaming\sys.exe

C:\Users\Admin\AppData\Roaming\sys.exe

C:\Users\Admin\AppData\Roaming\sys.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 18.24.18.2.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
NL 23.62.61.139:443 www.bing.com tcp
US 8.8.8.8:53 139.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 sent-down.gl.at.ply.gg udp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp
US 147.185.221.16:2905 sent-down.gl.at.ply.gg tcp

Files

memory/2600-0-0x00007FF8B17D3000-0x00007FF8B17D5000-memory.dmp

memory/2600-1-0x00000000001A0000-0x00000000001BA000-memory.dmp

memory/2088-11-0x0000014D6F9A0000-0x0000014D6F9C2000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1fd5dpra.yvs.psm1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/2088-12-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

memory/2088-13-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

memory/2088-14-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

memory/2088-17-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

MD5 6d3e9c29fe44e90aae6ed30ccf799ca8
SHA1 c7974ef72264bbdf13a2793ccf1aed11bc565dce
SHA256 2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
SHA512 60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

MD5 eb1ad317bd25b55b2bbdce8a28a74a94
SHA1 98a3978be4d10d62e7411946474579ee5bdc5ea6
SHA256 9e94e7c9ac6134ee30e79498558aa1a5a1ac79a643666c3f8922eed215dd3a98
SHA512 d011f266c0240d84470c0f9577cd9e4927309bd19bb38570ca9704ed8e1d159f9bea982a59d3eefef72ce7a10bd81208b82e88ef57c7af587f7437a89769adc0

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

MD5 31021d3765d703e67414edc3a3ba6100
SHA1 c0f9e120ac9090318c7c5b7bcb507c3c79b97777
SHA256 a2f3652121ade79e390072d5e35116a7287a82b21442a68724b776090930b513
SHA512 af844b43ea0829537d574ecc1ad643e2e88c036f4a2fd3f35f7177a8a407e1ab1ca21d1e935346ebe7575f1766a5c2723409f32593e872908997187a5cf1e606

memory/2600-56-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

memory/2600-57-0x00007FF8B17D3000-0x00007FF8B17D5000-memory.dmp

memory/2600-58-0x00007FF8B17D0000-0x00007FF8B2291000-memory.dmp

C:\Users\Admin\AppData\Roaming\sys.exe

MD5 15966aaa6973e8710c21dbb9d232a5f2
SHA1 99436fb15633ea4331872cacdcbde492df30dda1
SHA256 ccf87c21e3783012b150a710bf7007ea3aac1b3cb6d2855a1fd78b40f0175da9
SHA512 f35926607346f3472268a3c4f3106a929470211d47bd58230ac3e432208af204e4350a56fe7ec80865fbe80809c32a034cf356ce4db96fb57be6e9cf55da85fd

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\sys.exe.log

MD5 2ff39f6c7249774be85fd60a8f9a245e
SHA1 684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA256 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
SHA512 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1