xworm | 15b874bf48138911f8e51bcd50b8fbfbb92b2195e841e8f019ec0a4bf43d0b3c

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
14/06/2024, 06:21

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General

Target
workpls.exe
Size 80KB
Sample240614-g4algasbkn
SHA256 15b874bf48138911f8e51bcd50b8fbfbb92b2195e841e8f019ec0a4bf43d0b3c
MD5 7c5b4c2fb85480f3b020cabc27349803
SHA1 b32c34e787dfc4caf435e136d24bf561568aaedb
SHA512 be8a1e88f5a9b3b022417aeecbe9a984f271434a64946ead097171311d66ae722be402f1f70d873c7db374ce32975a33edbd00d078c58c7dba0f294c958ed0b2
SSDEEP 1536:tsONV0sICTBhsZBjCDTVj+bE8v5Cq6+uz1d46aI498NOkYF1Z:ts32tOKl+bEf+cd0I3OkEX
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Attributes

Install_directory
%AppData%
install_file
XClient.exe
pastebin_url
https://pastebin.com/raw/YetBwjAF

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4508-0-0x00000000002C0000-0x00000000002DA000-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
2296	powershell.exe
2064	powershell.exe
740	powershell.exe
1620	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-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	workpls.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	workpls.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XClient.lnk	workpls.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-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XClient = "C:\\Users\\Admin\\AppData\\Roaming\\XClient.exe"	workpls.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 10 IoCs

Web Service

T1102

flow	ioc
18	pastebin.com
35	pastebin.com
7	pastebin.com
14	pastebin.com
17	pastebin.com
21	pastebin.com
32	pastebin.com
3	pastebin.com
16	pastebin.com
19	pastebin.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1620	powershell.exe
1620	powershell.exe
2296	powershell.exe
2296	powershell.exe
2064	powershell.exe
2064	powershell.exe
740	powershell.exe
740	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	4508	workpls.exe
Token: SeDebugPrivilege	1620	powershell.exe
Token: SeDebugPrivilege	2296	powershell.exe
Token: SeDebugPrivilege	2064	powershell.exe
Token: SeDebugPrivilege	740	powershell.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4508 wrote to memory of 1620	4508	workpls.exe	93
PID 4508 wrote to memory of 1620	4508	workpls.exe	93
PID 4508 wrote to memory of 2296	4508	workpls.exe	95
PID 4508 wrote to memory of 2296	4508	workpls.exe	95
PID 4508 wrote to memory of 2064	4508	workpls.exe	98
PID 4508 wrote to memory of 2064	4508	workpls.exe	98
PID 4508 wrote to memory of 740	4508	workpls.exe	100
PID 4508 wrote to memory of 740	4508	workpls.exe	100

C:\Users\Admin\AppData\Local\Temp\workpls.exe
"C:\Users\Admin\AppData\Local\Temp\workpls.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4508
- 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'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1620
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'workpls.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2296
- 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'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2064
- 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:740

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
1⤵
PID:5116

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb
MD5 77d622bb1a5b250869a3238b9bc1402b
SHA1 d47f4003c2554b9dfc4c16f22460b331886b191b
SHA512 d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 e2fb83098e114084f51ed7187334f861ce670051046c39f338928296ca9a49cf
MD5 0256bd284691ed0fc502ef3c8a7e58dc
SHA1 dcdf69dc8ca8bf068f65d20ef1563bbe283e2413
SHA512 c5b29c1e0a15ddb68b0579848066774fa7cdc6f35087bbbf47c05a5c0dcc1eb3e61b2ddadfbded8c1ed9820e637596a9f08a97db8fb18000d168e6b159060c42
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 900aa2c83ec8773c3f9705f75b28fff0eaca57f7adb33dc82564d7ea8f8069a3
MD5 07ab6cc81c5230a598c0ad1711b6bd97
SHA1 de7e270e12d447dfc5896b7c96777eb32725778a
SHA512 ffef0ad0824ea0fdab29eb3c44448100f79365a1729c7665eba9aef85a88e60901bc6a6c248de15a28d21be9ce5839d68861e4449ff557d8845927c740ba3a25
MD5 SHA1 SHA512

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__PSScriptPolicyTest_svkk1ecz.pka.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_svkk1ecz.pka.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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

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

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memory/1620-17-0x00007FFC83720000-0x00007FFC841E1000-memory.dmp

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

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

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

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

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

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

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