91a21670aa845299ddd440c60fb0fde8eac30a0cb426cff86eea71e8a642e2df

Analysis

max time kernel
145s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20231020-en
resource tags

arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
submitted
24/11/2023, 00:04

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General

Target

91a21670aa845299ddd440c60fb0fde8eac30a0cb426cff86eea71e8a642e2df.dll
Size

240KB
MD5

d7bd27ad00803b9c5632125f7bcf81e9
SHA1

b386eec1e2a621182b4ae2076590121a02416a21
SHA256

91a21670aa845299ddd440c60fb0fde8eac30a0cb426cff86eea71e8a642e2df
SHA512

29170da1c0016af07a24c4d51586ba893188315c7e4257d23e7e0462c9f910f6698e057f3774f69300ca0152f1ca18cc073768cb38d2e33c0fbded326740092f
SSDEEP

6144:65r3lV6n42+3WSKhxD8RVo2rcaGKNqAwyotp2R:6C+3xWDY9IpKNTwyo2

Score

8^/10

bootkit persistence spyware stealer

Malware Config

Signatures

Blocklisted process makes network request 7 IoCs

flow	pid	Process
14	4836	rundll32.exe
22	4836	rundll32.exe
24	4836	rundll32.exe
25	4836	rundll32.exe
40	4836	rundll32.exe
50	4836	rundll32.exe
51	4836	rundll32.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

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-1-5-21-3811856890-180006922-3689258494-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Platform = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\91a21670aa845299ddd440c60fb0fde8eac30a0cb426cff86eea71e8a642e2df.dll\",Erase"	rundll32.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe

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	rundll32.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4836	rundll32.exe
4836	rundll32.exe
4836	rundll32.exe
4836	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4836	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2740 wrote to memory of 4836	2740	rundll32.exe	83
PID 2740 wrote to memory of 4836	2740	rundll32.exe	83
PID 2740 wrote to memory of 4836	2740	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a21670aa845299ddd440c60fb0fde8eac30a0cb426cff86eea71e8a642e2df.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2740
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\91a21670aa845299ddd440c60fb0fde8eac30a0cb426cff86eea71e8a642e2df.dll,#1
  2⤵
  - Blocklisted process makes network request
  - Adds Run key to start application
  - Enumerates connected drives
  - Writes to the Master Boot Record (MBR)
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4836

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/4836-0-0x0000000010000000-0x000000001008E000-memory.dmp

Filesize
568KB

Download
memory/4836-1-0x0000000010000000-0x000000001008E000-memory.dmp

Filesize
568KB

Download
memory/4836-4-0x0000000010000000-0x000000001008E000-memory.dmp

Filesize
568KB

Download