3968a850f5bc70d954bb5609d929f181a6f05a117fa3be4531cbd96cedfde5d6

Analysis

max time kernel
117s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
19-12-2024 22:23

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General

Target

LBB_ReflectiveDll_DllMain.dll
Size

113KB
MD5

ab5bdca69285d4838af12117c910bfde
SHA1

208060cf988f1702124504bae0c6a4addbeb6db3
SHA256

5594fea724aa3a124b259e81999f20affecb2238f7e517c56c450a3a311ab2bd
SHA512

33c8cb31dd142defcf52ddadaa540d86d8fdd586ad3f0f280d90c66279cf09229edde08efb9daac81383f65ba171b86344c4e5c6343b02270bfa92201e08f547
SSDEEP

3072:+/fNzovq5EKHttru48dBVFktgraAyHXU:+/Gvq5EKH6zdrFPraA

Score

9^/10

defense_evasion discovery ransomware

Malware Config

Signatures

Renames multiple (196) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Executes dropped EXE 2 IoCs

pid	Process
2788	D817.tmp
2912	D894.tmp

Loads dropped DLL 2 IoCs

pid	Process
2252	rundll32.exe
2252	rundll32.exe

Indicator Removal: File Deletion 1 TTPs
Adversaries may delete files left behind by the actions of their intrusion activity.
defense_evasion

File Deletion
T1070.004

Sets desktop wallpaper using registry 2 TTPs 2 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Control Panel\Desktop\WallPaper = "C:\\ProgramData\\kF0wnCN24.bmp"	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Control Panel\Desktop\Wallpaper = "C:\\ProgramData\\kF0wnCN24.bmp"	rundll32.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 9 IoCs

pid	Process
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2788	D817.tmp
2252	rundll32.exe
2912	D894.tmp

System Location Discovery: System Language Discovery 1 TTPs 3 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	D894.tmp
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies Control Panel 2 IoCs

evasion

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Control Panel\Desktop	rundll32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Control Panel\Desktop\WallpaperStyle = "10"	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\kF0wnCN24\DefaultIcon	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\kF0wnCN24	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\kF0wnCN24\DefaultIcon\ = "C:\\ProgramData\\kF0wnCN24.ico"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\.kF0wnCN24	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.kF0wnCN24\ = "kF0wnCN24"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe
2252	rundll32.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeAssignPrimaryTokenPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeDebugPrivilege	2252	rundll32.exe
Token: 36	2252	rundll32.exe
Token: SeImpersonatePrivilege	2252	rundll32.exe
Token: SeIncBasePriorityPrivilege	2252	rundll32.exe
Token: SeIncreaseQuotaPrivilege	2252	rundll32.exe
Token: 33	2252	rundll32.exe
Token: SeManageVolumePrivilege	2252	rundll32.exe
Token: SeProfSingleProcessPrivilege	2252	rundll32.exe
Token: SeRestorePrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSystemProfilePrivilege	2252	rundll32.exe
Token: SeTakeOwnershipPrivilege	2252	rundll32.exe
Token: SeShutdownPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeDebugPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeBackupPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe
Token: SeSecurityPrivilege	2252	rundll32.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2228 wrote to memory of 2252	2228	rundll32.exe	31
PID 2252 wrote to memory of 2788	2252	rundll32.exe	36
PID 2252 wrote to memory of 2788	2252	rundll32.exe	36
PID 2252 wrote to memory of 2788	2252	rundll32.exe	36
PID 2252 wrote to memory of 2788	2252	rundll32.exe	36
PID 2252 wrote to memory of 2788	2252	rundll32.exe	36
PID 2252 wrote to memory of 2912	2252	rundll32.exe	37
PID 2252 wrote to memory of 2912	2252	rundll32.exe	37
PID 2252 wrote to memory of 2912	2252	rundll32.exe	37
PID 2252 wrote to memory of 2912	2252	rundll32.exe	37
PID 2252 wrote to memory of 2912	2252	rundll32.exe	37
PID 2912 wrote to memory of 2688	2912	D894.tmp	38
PID 2912 wrote to memory of 2688	2912	D894.tmp	38
PID 2912 wrote to memory of 2688	2912	D894.tmp	38
PID 2912 wrote to memory of 2688	2912	D894.tmp	38

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\LBB_ReflectiveDll_DllMain.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2228
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\LBB_ReflectiveDll_DllMain.dll,#1
  2⤵
  - Loads dropped DLL
  - Sets desktop wallpaper using registry
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Modifies Control Panel
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2252
- - C:\ProgramData\D817.tmp
    "C:\ProgramData\D817.tmp"
    3⤵
    - Executes dropped EXE
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    PID:2788
- - C:\ProgramData\D894.tmp
    "C:\ProgramData\D894.tmp"
    3⤵
    - Executes dropped EXE
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2912
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C DEL /F /Q C:\PROGRA~3\D894.tmp >> NUL
      4⤵
      System Location Discovery: System Language Discovery
      PID:2688

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
PID:2692

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x14c
1⤵
PID:2096

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

T1491

Replay Monitor

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Downloads

C:\Users\kF0wnCN24.README.txt

Filesize
6KB

MD5
9eac0427cdc3f9a6fc550f200077702b

SHA1
5a0c9c3b541ab116248fc3143047440589a9011a

SHA256
18e7f96d46bfd5df8583b1a15850a25031c1c917a9bdcee1fa7d540ef5ed2a07

SHA512
f2646613ab7b43f87bfbb99daa690d569f9d47e8c8c76301c0496e1e89f8daa641fe86f2d573090852c6f958b64f8cdcf5ee7eb61f4db02e4c9811f60f9b9c55

Download Submit
\ProgramData\D817.tmp

Filesize
14KB

MD5
294e9f64cb1642dd89229fff0592856b

SHA1
97b148c27f3da29ba7b18d6aee8a0db9102f47c9

SHA256
917e115cc403e29b4388e0d175cbfac3e7e40ca1742299fbdb353847db2de7c2

SHA512
b87d531890bf1577b9b4af41dddb2cdbbfa164cf197bd5987df3a3075983645a3acba443e289b7bfd338422978a104f55298fbfe346872de0895bde44adc89cf

Download Submit
memory/2252-0-0x0000000002310000-0x0000000002350000-memory.dmp

Filesize
256KB

Download
memory/2252-249-0x0000000000300000-0x0000000000340000-memory.dmp

Filesize
256KB

Download
memory/2788-245-0x000000007EFA0000-0x000000007EFA1000-memory.dmp

Filesize
4KB

Download
memory/2788-246-0x00000000021A0000-0x00000000021E0000-memory.dmp

Filesize
256KB

Download
memory/2788-247-0x000000007EF80000-0x000000007EF81000-memory.dmp

Filesize
4KB

Download
memory/2788-248-0x000000007EF20000-0x000000007EF21000-memory.dmp

Filesize
4KB

Download
memory/2912-262-0x000000007EF60000-0x000000007EF61000-memory.dmp

Filesize
4KB

Download
memory/2912-261-0x000000007EF40000-0x000000007EF41000-memory.dmp

Filesize
4KB

Download
memory/2912-260-0x000000007EF20000-0x000000007EF21000-memory.dmp

Filesize
4KB

Download
memory/2912-259-0x000000007EF80000-0x000000007EF81000-memory.dmp

Filesize
4KB

Download
memory/2912-258-0x00000000003C0000-0x0000000000400000-memory.dmp

Filesize
256KB

Download
memory/2912-257-0x000000007EFA0000-0x000000007EFA1000-memory.dmp

Filesize
4KB

Download