xworm | ad7c6c4472e0b852df512b349b7a7a1552a475d56480d49229768b3fd84fd930

General

Target

Solara.exe
Size

72KB
MD5

ff53190ff85002b8d4b5e2956f0371e7
SHA1

87c9552b7fce68eae6353cf0b30d184c1bff9834
SHA256

ad7c6c4472e0b852df512b349b7a7a1552a475d56480d49229768b3fd84fd930
SHA512

e68c955d8c2fcb53b6b0a07f67b6a3a4da6ff1e4dea7efe89a6512eef8a2d791bdd507947c4f7eea869698b7705dde8cae68dbff6c09911fb7b9d466442bd0e7
SSDEEP

1536:AhrBfBi58U8LgYEVQT+bSctfycoMpe6WQOdCCR0jR1:ADLgYRT+bSctroLQOYW0d1

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

127.0.0.1:7000

217.105.23.4:7000

Attributes

Install_directory
%Public%
install_file
Update.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3020-1-0x00000000005B0000-0x00000000005C8000-memory.dmp	family_xworm
behavioral2/files/0x0018000000023a10-57.dat	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
3356	powershell.exe
3608	powershell.exe
2544	powershell.exe
2904	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-1-5-21-2818691465-3043947619-2475182763-1000\Control Panel\International\Geo\Nation	Solara.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 4 IoCs

pid	Process
3584	Update.exe
2704	Update.exe
4192	Update.exe
5060	Update.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-1-5-21-2818691465-3043947619-2475182763-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Update = "C:\\Users\\Public\\Update.exe"	Solara.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2440	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2544	powershell.exe
2544	powershell.exe
2904	powershell.exe
2904	powershell.exe
3356	powershell.exe
3356	powershell.exe
3608	powershell.exe
3608	powershell.exe
3020	Solara.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	3020	Solara.exe
Token: SeDebugPrivilege	2544	powershell.exe
Token: SeDebugPrivilege	2904	powershell.exe
Token: SeDebugPrivilege	3356	powershell.exe
Token: SeDebugPrivilege	3608	powershell.exe
Token: SeDebugPrivilege	3020	Solara.exe
Token: SeDebugPrivilege	3584	Update.exe
Token: SeDebugPrivilege	2704	Update.exe
Token: SeDebugPrivilege	4192	Update.exe
Token: SeDebugPrivilege	5060	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3020	Solara.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3020 wrote to memory of 2544	3020	Solara.exe	92
PID 3020 wrote to memory of 2544	3020	Solara.exe	92
PID 3020 wrote to memory of 2904	3020	Solara.exe	94
PID 3020 wrote to memory of 2904	3020	Solara.exe	94
PID 3020 wrote to memory of 3356	3020	Solara.exe	98
PID 3020 wrote to memory of 3356	3020	Solara.exe	98
PID 3020 wrote to memory of 3608	3020	Solara.exe	100
PID 3020 wrote to memory of 3608	3020	Solara.exe	100
PID 3020 wrote to memory of 2440	3020	Solara.exe	103
PID 3020 wrote to memory of 2440	3020	Solara.exe	103

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

C:\Users\Admin\AppData\Local\Temp\Solara.exe
"C:\Users\Admin\AppData\Local\Temp\Solara.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:3020
- 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\Solara.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2544
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Solara.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2904
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\Update.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3356
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Update.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3608
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Update" /tr "C:\Users\Public\Update.exe"
  2⤵
  - Creates scheduled task(s)
  PID:2440

C:\Users\Public\Update.exe
C:\Users\Public\Update.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3584

C:\Users\Public\Update.exe
C:\Users\Public\Update.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2704

C:\Users\Public\Update.exe
C:\Users\Public\Update.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4192

C:\Users\Public\Update.exe
C:\Users\Public\Update.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5060

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
944B

MD5
34f595487e6bfd1d11c7de88ee50356a

SHA1
4caad088c15766cc0fa1f42009260e9a02f953bb

SHA256
0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d

SHA512
10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b

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

Filesize
944B

MD5
dd1d0b083fedf44b482a028fb70b96e8

SHA1
dc9c027937c9f6d52268a1504cbae42a39c8d36a

SHA256
cab7944d29e0501dc0db904ac460ca7a87700e0ec7eb62298b7b97cbf40c424c

SHA512
96bec38bfda176292ae65dcf735103e7888baa212038737c1d1e215fcb76e4c0355e4a827a1934303e7aecae91012fa412f13e38f382b732758bae985cc67973

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ibjtijt5.iix.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Public\Update.exe

Filesize
72KB

MD5
ff53190ff85002b8d4b5e2956f0371e7

SHA1
87c9552b7fce68eae6353cf0b30d184c1bff9834

SHA256
ad7c6c4472e0b852df512b349b7a7a1552a475d56480d49229768b3fd84fd930

SHA512
e68c955d8c2fcb53b6b0a07f67b6a3a4da6ff1e4dea7efe89a6512eef8a2d791bdd507947c4f7eea869698b7705dde8cae68dbff6c09911fb7b9d466442bd0e7

Download Submit
memory/2544-12-0x00007FFA81D30000-0x00007FFA827F1000-memory.dmp

Filesize
10.8MB

Download
memory/2544-17-0x00007FFA81D30000-0x00007FFA827F1000-memory.dmp

Filesize
10.8MB

Download
memory/2544-14-0x00007FFA81D30000-0x00007FFA827F1000-memory.dmp

Filesize
10.8MB

Download
memory/2544-13-0x00007FFA81D30000-0x00007FFA827F1000-memory.dmp

Filesize
10.8MB

Download
memory/2544-4-0x0000027508B20000-0x0000027508B42000-memory.dmp

Filesize
136KB

Download
memory/3020-0-0x00007FFA81D33000-0x00007FFA81D35000-memory.dmp

Filesize
8KB

Download
memory/3020-56-0x00007FFA81D30000-0x00007FFA827F1000-memory.dmp

Filesize
10.8MB

Download
memory/3020-59-0x00007FFA81D33000-0x00007FFA81D35000-memory.dmp

Filesize
8KB

Download
memory/3020-61-0x00007FFA81D30000-0x00007FFA827F1000-memory.dmp

Filesize
10.8MB

Download
memory/3020-1-0x00000000005B0000-0x00000000005C8000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads