a4ba1595bb74b6e6e37d19cc4e74a9b77e66d32222c428a0ac7cf4f9795d6d79

General

Target
a4ba1595bb74b6e6e37d19cc4e74a9b77e66d32222c428a0ac7cf4f9795d6d79N.dll
Size 134KB
Sample241016-hp11jssekl
SHA256 a4ba1595bb74b6e6e37d19cc4e74a9b77e66d32222c428a0ac7cf4f9795d6d79
MD5 8730df7a6cc1de6ca03b3a53d39e2d30
SHA1 b09695b0ae545fe8ab02cbb09e8f50f707b38baa
SHA512 19c0a54887b6d6118ffcbf5c56eb53351225ba52c82c90fdf9f63f76f4e9aaa48f8269d4fd1b2320947442190fcfdc233e4dd3f629f6a62f3dcdda8e8bb330c2
SSDEEP 1536:T27e/C4pNBoyI1cYwk0nHAQNQ5xlaZFfZvkSQizsssneATHII+uj4OjxYQb9EB:/RxoyI4k4FYxiQ7pnRTh+uj4OFNb9c
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

bootkit discovery persistence spyware stealer

Malware Config

Signatures

Blocklisted process makes network request 13 IoCs

flow	pid	Process
19	3872	rundll32.exe
22	3872	rundll32.exe
23	3872	rundll32.exe
24	3872	rundll32.exe
25	3872	rundll32.exe
33	3872	rundll32.exe
42	3872	rundll32.exe
47	3872	rundll32.exe
48	3872	rundll32.exe
55	3872	rundll32.exe
56	3872	rundll32.exe
59	3872	rundll32.exe
70	3872	rundll32.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

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-1-5-21-2437139445-1151884604-3026847218-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VIEW = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\a4ba1595bb74b6e6e37d19cc4e74a9b77e66d32222c428a0ac7cf4f9795d6d79N.dll\",Viewer"	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)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\y:	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

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3872	rundll32.exe
3872	rundll32.exe
3872	rundll32.exe
3872	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3872	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3920 wrote to memory of 3872	3920	rundll32.exe	84
PID 3920 wrote to memory of 3872	3920	rundll32.exe	84
PID 3920 wrote to memory of 3872	3920	rundll32.exe	84

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a4ba1595bb74b6e6e37d19cc4e74a9b77e66d32222c428a0ac7cf4f9795d6d79N.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3920
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\a4ba1595bb74b6e6e37d19cc4e74a9b77e66d32222c428a0ac7cf4f9795d6d79N.dll,#1
  2⤵
  - Blocklisted process makes network request
  - Adds Run key to start application
  - Enumerates connected drives
  - Writes to the Master Boot Record (MBR)
  - System Location Discovery: System Language Discovery
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3872