Malware Analysis Report

2024-09-11 14:08

Sample ID 240614-g4algasbkn
Target workpls.exe
SHA256 15b874bf48138911f8e51bcd50b8fbfbb92b2195e841e8f019ec0a4bf43d0b3c
Tags
xworm execution persistence rat trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

15b874bf48138911f8e51bcd50b8fbfbb92b2195e841e8f019ec0a4bf43d0b3c

Threat Level: Known bad

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

Malicious Activity Summary

xworm execution persistence rat trojan

Detect Xworm Payload

Xworm

Xworm family

Command and Scripting Interpreter: PowerShell

Checks computer location settings

Drops startup file

Adds Run key to start application

Legitimate hosting services abused for malware hosting/C2

Enumerates physical storage devices

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Command and Scripting Interpreter
T1059
PowerShell
T1059.001
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Defense Evasion
TA0005
Modify Registry
T1112
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Web Service
T1102
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-14 06:21

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

2024-06-14 06:21

Reported

2024-06-14 06:23

Platform

win7-20240508-en

Max time kernel

147s

Max time network

149s

Command Line

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

Signatures

Detect Xworm Payload

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

Xworm

trojan rat xworm

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Drops startup file

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2737914667-933161113-3798636211-1000\Software\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe" C:\Users\Admin\AppData\Local\Temp\workpls.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\workpls.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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1796 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2236 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2720 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2720 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2720 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2796 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2796 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2796 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2744 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2744 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1796 wrote to memory of 2744 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

Processes

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

"C:\Users\Admin\AppData\Local\Temp\workpls.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\workpls.exe'

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

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

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp

Files

memory/1796-0-0x000007FEF5E23000-0x000007FEF5E24000-memory.dmp

memory/1796-1-0x0000000001310000-0x000000000132A000-memory.dmp

memory/2236-6-0x0000000002B50000-0x0000000002BD0000-memory.dmp

memory/2236-7-0x000000001B650000-0x000000001B932000-memory.dmp

memory/2236-8-0x00000000020F0000-0x00000000020F8000-memory.dmp

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

MD5 c7108bc98a16e163f3675a2add8b530d
SHA1 4471ad5f3ed533a574013906ba2e72bde142798f
SHA256 2178b47691d32b20799dde90839d99dd18a1ff3b97e990083ae965a91ae774bc
SHA512 03979e3cad911fd2dd330c3e6dc23d71286f4195b1221ea7604005f748daff190b6d66b1181a9f9d16fc0b2c2f44153cce58fdc1885dcf48d30e1814f3d5ee54

memory/2720-14-0x000000001B800000-0x000000001BAE2000-memory.dmp

memory/2720-15-0x0000000002340000-0x0000000002348000-memory.dmp

memory/1796-30-0x0000000000D40000-0x0000000000DC0000-memory.dmp

memory/1796-31-0x000007FEF5E23000-0x000007FEF5E24000-memory.dmp

memory/1796-32-0x0000000000D40000-0x0000000000DC0000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-14 06:21

Reported

2024-06-14 06:23

Platform

win10v2004-20240508-en

Max time kernel

149s

Max time network

151s

Command Line

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

Signatures

Detect Xworm Payload

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

Xworm

trojan rat xworm

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\workpls.exe N/A

Drops startup file

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe" C:\Users\Admin\AppData\Local\Temp\workpls.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\workpls.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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4508 wrote to memory of 1620 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 1620 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 2296 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 2296 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 2064 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 740 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4508 wrote to memory of 740 N/A C:\Users\Admin\AppData\Local\Temp\workpls.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

Processes

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

"C:\Users\Admin\AppData\Local\Temp\workpls.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\workpls.exe'

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

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

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=3240,i,16488180140590516186,11762960689811837350,262144 --variations-seed-version --mojo-platform-channel-handle=3772 /prefetch:8

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\XClient.exe'

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp
US 8.8.8.8:53 pastebin.com udp

Files

memory/4508-1-0x00007FFC83723000-0x00007FFC83725000-memory.dmp

memory/4508-0-0x00000000002C0000-0x00000000002DA000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_svkk1ecz.pka.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/1620-7-0x0000023AF1CB0000-0x0000023AF1CD2000-memory.dmp

memory/1620-12-0x00007FFC83720000-0x00007FFC841E1000-memory.dmp

memory/1620-13-0x00007FFC83720000-0x00007FFC841E1000-memory.dmp

memory/1620-14-0x00007FFC83720000-0x00007FFC841E1000-memory.dmp

memory/1620-17-0x00007FFC83720000-0x00007FFC841E1000-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 77d622bb1a5b250869a3238b9bc1402b
SHA1 d47f4003c2554b9dfc4c16f22460b331886b191b
SHA256 f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb
SHA512 d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

MD5 0256bd284691ed0fc502ef3c8a7e58dc
SHA1 dcdf69dc8ca8bf068f65d20ef1563bbe283e2413
SHA256 e2fb83098e114084f51ed7187334f861ce670051046c39f338928296ca9a49cf
SHA512 c5b29c1e0a15ddb68b0579848066774fa7cdc6f35087bbbf47c05a5c0dcc1eb3e61b2ddadfbded8c1ed9820e637596a9f08a97db8fb18000d168e6b159060c42

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

MD5 07ab6cc81c5230a598c0ad1711b6bd97
SHA1 de7e270e12d447dfc5896b7c96777eb32725778a
SHA256 900aa2c83ec8773c3f9705f75b28fff0eaca57f7adb33dc82564d7ea8f8069a3
SHA512 ffef0ad0824ea0fdab29eb3c44448100f79365a1729c7665eba9aef85a88e60901bc6a6c248de15a28d21be9ce5839d68861e4449ff557d8845927c740ba3a25

memory/4508-56-0x00007FFC83720000-0x00007FFC841E1000-memory.dmp

memory/4508-57-0x00007FFC83720000-0x00007FFC841E1000-memory.dmp