xworm | 58b0a1a32bd96f09ac520b8a7433cc86f0ac5c3fa1df4741dd8b2bd12713f749

General

Target

bebra.exe
Size

74KB
MD5

669e9e7f8c7290ffda453a62f14ca030
SHA1

4eabe1cb31a0c2ed609fcdef7a5d2ca0bfff328c
SHA256

58b0a1a32bd96f09ac520b8a7433cc86f0ac5c3fa1df4741dd8b2bd12713f749
SHA512

bbc310297435462479a6035e0522ce3da55bac7ca2b1fd77825a798b70f84edb4402405b25cfb33d0dad808570f6b1dab88f7699d0d4777a97465d8183075655
SSDEEP

1536:BKru/Ft/VKQWRdx0zaYEeqbGxkwfTlk6QUGH+meODiDDO1:UrWF1MpAEeqbG6IywmeOWDi1

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

consider-catalog.gl.at.ply.gg:61770

Attributes

Install_directory
%AppData%
install_file
bebra.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/4768-1-0x0000000000A40000-0x0000000000A58000-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
4900	powershell.exe
2404	powershell.exe
4620	powershell.exe
2552	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-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	bebra.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bebra.lnk	bebra.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bebra.lnk	bebra.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-1-5-21-1337824034-2731376981-3755436523-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\bebra = "C:\\Users\\Admin\\AppData\\Roaming\\bebra.exe"	bebra.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
22	ip-api.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4900	powershell.exe
4900	powershell.exe
2404	powershell.exe
2404	powershell.exe
4620	powershell.exe
4620	powershell.exe
2552	powershell.exe
2552	powershell.exe
4768	bebra.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4768	bebra.exe
Token: SeDebugPrivilege	4900	powershell.exe
Token: SeDebugPrivilege	2404	powershell.exe
Token: SeDebugPrivilege	4620	powershell.exe
Token: SeDebugPrivilege	2552	powershell.exe
Token: SeDebugPrivilege	4768	bebra.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4768	bebra.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4768 wrote to memory of 4900	4768	bebra.exe	90
PID 4768 wrote to memory of 4900	4768	bebra.exe	90
PID 4768 wrote to memory of 2404	4768	bebra.exe	93
PID 4768 wrote to memory of 2404	4768	bebra.exe	93
PID 4768 wrote to memory of 4620	4768	bebra.exe	95
PID 4768 wrote to memory of 4620	4768	bebra.exe	95
PID 4768 wrote to memory of 2552	4768	bebra.exe	97
PID 4768 wrote to memory of 2552	4768	bebra.exe	97

C:\Users\Admin\AppData\Local\Temp\bebra.exe
"C:\Users\Admin\AppData\Local\Temp\bebra.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4768
- 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\bebra.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4900
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'bebra.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2404
- 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\bebra.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4620
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'bebra.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2552

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
944B

MD5
0256bd284691ed0fc502ef3c8a7e58dc

SHA1
dcdf69dc8ca8bf068f65d20ef1563bbe283e2413

SHA256
e2fb83098e114084f51ed7187334f861ce670051046c39f338928296ca9a49cf

SHA512
c5b29c1e0a15ddb68b0579848066774fa7cdc6f35087bbbf47c05a5c0dcc1eb3e61b2ddadfbded8c1ed9820e637596a9f08a97db8fb18000d168e6b159060c42

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

Filesize
944B

MD5
cc19bcff372d20459d3651ba8aef50e7

SHA1
3c6f1d4cdd647864fb97a16b1aefba67fcee11f7

SHA256
366473e774d8976c7fd4dc582220666fb61a4feb3f7c95e69b2a68ad9e446ec9

SHA512
a0e360ca4b6e874fd44612bf4b17f3722c0619da4f6bade12a62efadae88c2d33460114eaafa2bc3fb1cef5bea07e745b8bee24f15d0cacaff5f4a521b225080

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ozz3nqgg.duf.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4768-1-0x0000000000A40000-0x0000000000A58000-memory.dmp

Filesize
96KB

Download
memory/4768-2-0x00007FF85B420000-0x00007FF85BEE1000-memory.dmp

Filesize
10.8MB

Download
memory/4768-60-0x00007FF85B420000-0x00007FF85BEE1000-memory.dmp

Filesize
10.8MB

Download
memory/4768-0-0x00007FF85B423000-0x00007FF85B425000-memory.dmp

Filesize
8KB

Download
memory/4768-58-0x00007FF85B423000-0x00007FF85B425000-memory.dmp

Filesize
8KB

Download
memory/4768-57-0x000000001BCC0000-0x000000001BDC2000-memory.dmp

Filesize
1.0MB

Download
memory/4900-4-0x00007FF85B420000-0x00007FF85BEE1000-memory.dmp

Filesize
10.8MB

Download
memory/4900-18-0x00007FF85B420000-0x00007FF85BEE1000-memory.dmp

Filesize
10.8MB

Download
memory/4900-6-0x00007FF85B420000-0x00007FF85BEE1000-memory.dmp

Filesize
10.8MB

Download
memory/4900-5-0x000001C65A4B0000-0x000001C65A4D2000-memory.dmp

Filesize
136KB

Download
memory/4900-3-0x00007FF85B420000-0x00007FF85BEE1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads