xworm | 05084a87d2dd351fb6a96d2cf873912d0c205e27300779c1f6e3aa61ad66c9d8

General

Target

VixenLoader.exe
Size

24KB
MD5

56508d7616007b172ca2606cefd7bdd6
SHA1

dd610f2bac2f687632135be864b2efb9f79aca07
SHA256

05084a87d2dd351fb6a96d2cf873912d0c205e27300779c1f6e3aa61ad66c9d8
SHA512

d5be1f3ce5f5d51b61561d09e8a22fe748ebacd55699e8ac98e206c4ef319b6a4fa3702987abc78d3856e897b8a5df1f72de3f53a8a05e94a11e382665b719a9
SSDEEP

384:efX3wDHuqrAFKNOPhXTgGS76xUBUv1+RKaM5EIAvuLNoo3QJ:xuqrAFKNOPhXTZ9qy9+RE5D4kb3Q

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

137.184.74.73:5000

Mutex

Y2rnj2CSRObOXXLb

Attributes

Install_directory
%ProgramData%
install_file
System.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/2276-53-0x00000000016D0000-0x00000000016DE000-memory.dmp	family_xworm

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

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4308	powershell.exe
2160	powershell.exe

Downloads MZ/PE file

Checks computer location settings 2 TTPs 2 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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	Vixen.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	AggregatorHost.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System.lnk	AggregatorHost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System.lnk	AggregatorHost.exe

Executes dropped EXE 4 IoCs

pid	Process
1288	Vixen.exe
2276	AggregatorHost.exe
2964	System.exe
3756	System.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
22	raw.githubusercontent.com
23	raw.githubusercontent.com

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
428	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1976	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4308	powershell.exe
4308	powershell.exe
4308	powershell.exe
2160	powershell.exe
2160	powershell.exe
2160	powershell.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	1288	Vixen.exe
Token: SeBackupPrivilege	5072	vssvc.exe
Token: SeRestorePrivilege	5072	vssvc.exe
Token: SeAuditPrivilege	5072	vssvc.exe
Token: SeDebugPrivilege	4308	powershell.exe
Token: SeDebugPrivilege	2160	powershell.exe
Token: SeDebugPrivilege	2276	AggregatorHost.exe
Token: SeDebugPrivilege	2276	AggregatorHost.exe
Token: SeDebugPrivilege	2964	System.exe
Token: SeDebugPrivilege	3756	System.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 628	5004	VixenLoader.exe	102
PID 5004 wrote to memory of 628	5004	VixenLoader.exe	102
PID 628 wrote to memory of 1288	628	cmd.exe	103
PID 628 wrote to memory of 1288	628	cmd.exe	103
PID 1288 wrote to memory of 4308	1288	Vixen.exe	108
PID 1288 wrote to memory of 4308	1288	Vixen.exe	108
PID 1288 wrote to memory of 2160	1288	Vixen.exe	111
PID 1288 wrote to memory of 2160	1288	Vixen.exe	111
PID 1288 wrote to memory of 1648	1288	Vixen.exe	114
PID 1288 wrote to memory of 1648	1288	Vixen.exe	114
PID 1648 wrote to memory of 428	1648	cmd.exe	116
PID 1648 wrote to memory of 428	1648	cmd.exe	116
PID 2276 wrote to memory of 1976	2276	AggregatorHost.exe	117
PID 2276 wrote to memory of 1976	2276	AggregatorHost.exe	117

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
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\VixenLoader.exe
"C:\Users\Admin\AppData\Local\Temp\VixenLoader.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c Vixen.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:628
- - C:\Users\Admin\AppData\Local\Temp\Vixen.exe
    Vixen.exe
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1288
  - - 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\AggregatorHost.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4308
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'AggregatorHost.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2160
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpFB19.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1648
    - - C:\Windows\system32\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:428

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5072

C:\Users\Admin\AppData\Roaming\AggregatorHost.exe
C:\Users\Admin\AppData\Roaming\AggregatorHost.exe
1⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2276
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System" /tr "C:\ProgramData\System.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1976

C:\ProgramData\System.exe
C:\ProgramData\System.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2964

C:\ProgramData\System.exe
C:\ProgramData\System.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3756

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
1KB

MD5
c952c967a6c1013f7155cc3efed8cd03

SHA1
dc5bbab6c51387ee4d9863415a196e297457d045

SHA256
f825024aeb196af7aa49d77dccfae841aa55f9fef1c1f6f8f1e0c61032f8be12

SHA512
8126ef222f9ed0f332f56b8754ed24845fc03fadcbe61bf6d82e07da81b143e120ce82be14e59dc98b460e399563e8461bf0925089a71008af58b3acd6d6afef

Download Submit
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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

Download Submit
C:\Users\Admin\AppData\Local\Temp\Vixen.exe

Filesize
227KB

MD5
38b7704d2b199559ada166401f1d51c1

SHA1
3376eec35cd4616ba8127b976a8667e7a0aac87d

SHA256
153825af8babb75361f4af359bfdd5e95cbdc7f263db5c4e70ac1da8f36bc564

SHA512
07b828073c8f80c5498501c8f64decb5effa702c8bc3d60a2f7d5de36d493b469cbbf413fb0c92c0aadd6ee139bfb75f3b9e936230212d42e57d2ec5671e9b27

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_3mucp4wd.yeb.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpFB19.tmp.bat

Filesize
157B

MD5
7a94f10de8123e2cb0e7c8bdb52d0006

SHA1
4d27579ca697c735bde6f5d825dc516daabf1624

SHA256
7b9c4cfd245674654e031fc622a5d782ec234242974040b370f3976fcf7f3d9f

SHA512
aaf6338f46678295e2832ead5891bf0f5accf63525aac7e438509510c340e6e1f8a1b4fbe4b841dd880072896dfbd33cc0ffd624aec6801d993a0deb9bba8634

Download Submit
memory/1288-18-0x0000000000D70000-0x0000000000DB0000-memory.dmp

Filesize
256KB

Download
memory/1288-17-0x00007FFCBC163000-0x00007FFCBC165000-memory.dmp

Filesize
8KB

Download
memory/1288-46-0x00007FFCBC160000-0x00007FFCBCC21000-memory.dmp

Filesize
10.8MB

Download
memory/1288-51-0x00007FFCBC160000-0x00007FFCBCC21000-memory.dmp

Filesize
10.8MB

Download
memory/2276-53-0x00000000016D0000-0x00000000016DE000-memory.dmp

Filesize
56KB

Download
memory/4308-24-0x000001A9FF630000-0x000001A9FF652000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads