7c2d9e6e0ef4c1a1da1cc6c9402c8643518935756783d83bbfa70b71fe2e8d2a

General

Target
7c2d9e6e0ef4c1a1da1cc6c9402c8643518935756783d83bbfa70b71fe2e8d2aN.dll
Size 152KB
Sample241109-mch2essfjp
SHA256 7c2d9e6e0ef4c1a1da1cc6c9402c8643518935756783d83bbfa70b71fe2e8d2a
MD5 8d4330965006c1ea68010959eccd96a0
SHA1 d7fd70850a4ada79f1ad630230dccb03461d5f86
SHA512 04d7a82acd328b252507fff7bbe75729ab14ef702110918eefbb297f0c2032dbff7e5a6410f8a9f4d6b53c825b1aea492f7bd6888e52ae12bb26b9f124963342
SSDEEP 3072:ByLRmnX+Okrspw8oSgUZavaz0twh44hb3jRHFlSYt+Fd7:8LgX2ccoic40b3jRllSDf
MD5 SHA1 SHA512 SSDEEP

Score

8^/10

bootkit discovery persistence spyware stealer

Malware Config

Signatures

Blocklisted process makes network request 14 IoCs

flow	pid	Process
3	3808	rundll32.exe
7	3808	rundll32.exe
12	3808	rundll32.exe
14	3808	rundll32.exe
15	3808	rundll32.exe
22	3808	rundll32.exe
27	3808	rundll32.exe
40	3808	rundll32.exe
41	3808	rundll32.exe
42	3808	rundll32.exe
45	3808	rundll32.exe
53	3808	rundll32.exe
54	3808	rundll32.exe
55	3808	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-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\gBMP = "C:\\Windows\\SysWOW64\\rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\7c2d9e6e0ef4c1a1da1cc6c9402c8643518935756783d83bbfa70b71fe2e8d2aN.dll\",GetBMP"	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)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\x:	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 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
3808	rundll32.exe
3808	rundll32.exe
3808	rundll32.exe
3808	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3808	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2016 wrote to memory of 3808	2016	rundll32.exe	83
PID 2016 wrote to memory of 3808	2016	rundll32.exe	83
PID 2016 wrote to memory of 3808	2016	rundll32.exe	83

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\7c2d9e6e0ef4c1a1da1cc6c9402c8643518935756783d83bbfa70b71fe2e8d2aN.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2016
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\7c2d9e6e0ef4c1a1da1cc6c9402c8643518935756783d83bbfa70b71fe2e8d2aN.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:3808