umbral | b97e386e681f0aa6c3ffb15d972dfb7aed7b3ea5711d6e105850800a9688643e

Analysis

max time kernel
68s
max time network
84s
platform
windows10-2004_x64
resource
win10v2004-20240910-en
resource tags

arch:x64arch:x86image:win10v2004-20240910-enlocale:en-usos:windows10-2004-x64system
submitted
07-10-2024 10:10

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Reason

Machine shutdown

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General

Target

BootstrapperV18.exe
Size

67KB
MD5

3f194cb392261195f6354bfefacc8df6
SHA1

35ed93df509fb3b34cdcd6f39c645a8bc9bc63e5
SHA256

b97e386e681f0aa6c3ffb15d972dfb7aed7b3ea5711d6e105850800a9688643e
SHA512

f08bd41e4ed678f6ad315e0ef843110bc03c239b9b4f7bc3c45e3b5f1f16dde791b86cbb7289f1da962047605287c3e1d0da678572836f7965b2d42c595250e2
SSDEEP

1536:I06pVXzKc2nHLPdKLi/5F26T15TkbOLmobtO7hKD:I0BLnrMLi/O6TTkbOL7btO7ID

Score

10^/10

umbral xworm bootkit persistence rat stealer trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:4087

series-transition.gl.at.ply.gg:4087

Attributes

Install_directory
%AppData%
install_file
explorer.exe

Signatures

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral1/memory/2780-14-0x000000001C990000-0x000000001C99E000-memory.dmp	disable_win_def

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000300000001e748-19.dat	family_umbral
behavioral1/memory/3076-26-0x0000017454140000-0x0000017454180000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/memory/2780-1-0x0000000000630000-0x0000000000648000-memory.dmp	family_xworm
behavioral1/files/0x0002000000022b1b-8.dat	family_xworm

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

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-1-5-21-2629364133-3182087385-364449604-1000\Control Panel\International\Geo\Nation	BootstrapperV18.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\explorer.lnk	BootstrapperV18.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\explorer.lnk	BootstrapperV18.exe

Executes dropped EXE 3 IoCs

pid	Process
3272	explorer.exe
3076	cgbtnz.exe
4968	rjhwdi.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-1-5-21-2629364133-3182087385-364449604-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\explorer = "C:\\Users\\Admin\\AppData\\Roaming\\explorer.exe"	BootstrapperV18.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
53	ip-api.com

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	rjhwdi.exe

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

System Information Discovery
T1082

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
3628	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe
2780	BootstrapperV18.exe

Suspicious use of AdjustPrivilegeToken 47 IoCs

description	pid	Process
Token: SeDebugPrivilege	2780	BootstrapperV18.exe
Token: SeDebugPrivilege	2780	BootstrapperV18.exe
Token: SeDebugPrivilege	3272	explorer.exe
Token: SeDebugPrivilege	3076	cgbtnz.exe
Token: SeIncreaseQuotaPrivilege	1560	wmic.exe
Token: SeSecurityPrivilege	1560	wmic.exe
Token: SeTakeOwnershipPrivilege	1560	wmic.exe
Token: SeLoadDriverPrivilege	1560	wmic.exe
Token: SeSystemProfilePrivilege	1560	wmic.exe
Token: SeSystemtimePrivilege	1560	wmic.exe
Token: SeProfSingleProcessPrivilege	1560	wmic.exe
Token: SeIncBasePriorityPrivilege	1560	wmic.exe
Token: SeCreatePagefilePrivilege	1560	wmic.exe
Token: SeBackupPrivilege	1560	wmic.exe
Token: SeRestorePrivilege	1560	wmic.exe
Token: SeShutdownPrivilege	1560	wmic.exe
Token: SeDebugPrivilege	1560	wmic.exe
Token: SeSystemEnvironmentPrivilege	1560	wmic.exe
Token: SeRemoteShutdownPrivilege	1560	wmic.exe
Token: SeUndockPrivilege	1560	wmic.exe
Token: SeManageVolumePrivilege	1560	wmic.exe
Token: 33	1560	wmic.exe
Token: 34	1560	wmic.exe
Token: 35	1560	wmic.exe
Token: 36	1560	wmic.exe
Token: SeIncreaseQuotaPrivilege	1560	wmic.exe
Token: SeSecurityPrivilege	1560	wmic.exe
Token: SeTakeOwnershipPrivilege	1560	wmic.exe
Token: SeLoadDriverPrivilege	1560	wmic.exe
Token: SeSystemProfilePrivilege	1560	wmic.exe
Token: SeSystemtimePrivilege	1560	wmic.exe
Token: SeProfSingleProcessPrivilege	1560	wmic.exe
Token: SeIncBasePriorityPrivilege	1560	wmic.exe
Token: SeCreatePagefilePrivilege	1560	wmic.exe
Token: SeBackupPrivilege	1560	wmic.exe
Token: SeRestorePrivilege	1560	wmic.exe
Token: SeShutdownPrivilege	1560	wmic.exe
Token: SeDebugPrivilege	1560	wmic.exe
Token: SeSystemEnvironmentPrivilege	1560	wmic.exe
Token: SeRemoteShutdownPrivilege	1560	wmic.exe
Token: SeUndockPrivilege	1560	wmic.exe
Token: SeManageVolumePrivilege	1560	wmic.exe
Token: 33	1560	wmic.exe
Token: 34	1560	wmic.exe
Token: 35	1560	wmic.exe
Token: 36	1560	wmic.exe
Token: SeShutdownPrivilege	4968	rjhwdi.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2780 wrote to memory of 3628	2780	BootstrapperV18.exe	93
PID 2780 wrote to memory of 3628	2780	BootstrapperV18.exe	93
PID 2780 wrote to memory of 3076	2780	BootstrapperV18.exe	102
PID 2780 wrote to memory of 3076	2780	BootstrapperV18.exe	102
PID 3076 wrote to memory of 1560	3076	cgbtnz.exe	103
PID 3076 wrote to memory of 1560	3076	cgbtnz.exe	103
PID 2780 wrote to memory of 4968	2780	BootstrapperV18.exe	106
PID 2780 wrote to memory of 4968	2780	BootstrapperV18.exe	106
PID 2780 wrote to memory of 4968	2780	BootstrapperV18.exe	106

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\BootstrapperV18.exe
"C:\Users\Admin\AppData\Local\Temp\BootstrapperV18.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 WriteProcessMemory
PID:2780
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "explorer" /tr "C:\Users\Admin\AppData\Roaming\explorer.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3628
- C:\Users\Admin\AppData\Local\Temp\cgbtnz.exe
  "C:\Users\Admin\AppData\Local\Temp\cgbtnz.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3076
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1560
- C:\Users\Admin\AppData\Local\Temp\rjhwdi.exe
  "C:\Users\Admin\AppData\Local\Temp\rjhwdi.exe"
  2⤵
  - Executes dropped EXE
  - Writes to the Master Boot Record (MBR)
  - Suspicious use of AdjustPrivilegeToken
  PID:4968

C:\Users\Admin\AppData\Roaming\explorer.exe
C:\Users\Admin\AppData\Roaming\explorer.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
229KB

MD5
624eebb7053bf8a9f6b274682544c450

SHA1
1cff5f51c75bd64c46fddabbca26c62e34d42c97

SHA256
e82773cc163b4e8c62626e0d5691733e75abe27e80e57c697fbee5fe8d67149f

SHA512
0824828b680de1a7d3a2ba75db6fd8138275bd69127fdc450e020186dac6eceb781e8e36bb0bbc6408b7a1d5b8c0077945753f2a7a1ba196eed0e096bd6bd8a1

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

Filesize
225KB

MD5
af2379cc4d607a45ac44d62135fb7015

SHA1
39b6d40906c7f7f080e6befa93324dddadcbd9fa

SHA256
26b4699a7b9eeb16e76305d843d4ab05e94d43f3201436927e13b3ebafa90739

SHA512
69899c47d0b15f92980f79517384e83373242e045ca696c6e8f930ff6454219bf609e0d84c2f91d25dfd5ef3c28c9e099c4a3a918206e957be806a1c2e0d3e99

Download Submit
C:\Users\Admin\AppData\Roaming\explorer.exe

Filesize
67KB

MD5
3f194cb392261195f6354bfefacc8df6

SHA1
35ed93df509fb3b34cdcd6f39c645a8bc9bc63e5

SHA256
b97e386e681f0aa6c3ffb15d972dfb7aed7b3ea5711d6e105850800a9688643e

SHA512
f08bd41e4ed678f6ad315e0ef843110bc03c239b9b4f7bc3c45e3b5f1f16dde791b86cbb7289f1da962047605287c3e1d0da678572836f7965b2d42c595250e2

Download Submit
memory/2780-0-0x00007FF8DA9F3000-0x00007FF8DA9F5000-memory.dmp

Filesize
8KB

Download
memory/2780-1-0x0000000000630000-0x0000000000648000-memory.dmp

Filesize
96KB

Download
memory/2780-6-0x00007FF8DA9F0000-0x00007FF8DB4B1000-memory.dmp

Filesize
10.8MB

Download
memory/2780-7-0x00007FF8DA9F0000-0x00007FF8DB4B1000-memory.dmp

Filesize
10.8MB

Download
memory/2780-11-0x000000001BE80000-0x000000001BE8C000-memory.dmp

Filesize
48KB

Download
memory/2780-14-0x000000001C990000-0x000000001C99E000-memory.dmp

Filesize
56KB

Download
memory/3076-26-0x0000017454140000-0x0000017454180000-memory.dmp

Filesize
256KB

Download
memory/3272-10-0x00007FF8DA9F0000-0x00007FF8DB4B1000-memory.dmp

Filesize
10.8MB

Download
memory/3272-13-0x00007FF8DA9F0000-0x00007FF8DB4B1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads