e19a87d55e0edfcda9438310e10a004fcbb8e9946d3ca722ea21ab33aa24dbd9

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
29-12-2023 21:21

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General

Target

04538fda51509985af0682a14a2f3d0a.dll
Size

236KB
MD5

04538fda51509985af0682a14a2f3d0a
SHA1

8fa9a42fdc310570f296e3b5773a36057b276bfa
SHA256

e19a87d55e0edfcda9438310e10a004fcbb8e9946d3ca722ea21ab33aa24dbd9
SHA512

e14d3b5839539c194653cf619d101721f43024141960e52877b048d1fa7a2e7cd8066d394100e9acd975b465447a3ab791e4039d5376a3b1b1f50bb467a8fa8f
SSDEEP

1536:1dKaTHN2ymZ0ofa5uQm4V7HG8ldINh+RhFtFftCgpcGO5lPf/XG8GmGwktb4:1Y4tIQG8XAmbFfaGc1fawk14

Score

10^/10

persistence

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\gbcfc = "{c9a5aab8-412d-9672-523e-412d22305deb}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
456	rundll32.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\topsp.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\topsp.dll	rundll32.exe
File created	C:\Windows\SysWOW64\bwxax.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\bwxax.dll	rundll32.exe

Modifies registry class 5 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a5aab8-412d-9672-523e-412d22305deb}\InprocServer32\ = "C:\\Windows\\SysWow64\\bwxax.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a5aab8-412d-9672-523e-412d22305deb}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a5aab8-412d-9672-523e-412d22305deb}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a5aab8-412d-9672-523e-412d22305deb}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a5aab8-412d-9672-523e-412d22305deb}\InprocServer32	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
456	rundll32.exe
456	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	456	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
456	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 852 wrote to memory of 456	852	rundll32.exe	89
PID 852 wrote to memory of 456	852	rundll32.exe	89
PID 852 wrote to memory of 456	852	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\04538fda51509985af0682a14a2f3d0a.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:852
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\04538fda51509985af0682a14a2f3d0a.dll,#1
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:456

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

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\topsp.dll

Filesize
423KB

MD5
2499bcc183dbdaa424a6a5ad2bdaa988

SHA1
634cf679899cb63549f34a9269f79ef14701638d

SHA256
930adcaa3234118c53fcf8aad71202279f14b919b0c8ca864853d6a15ae0e5e9

SHA512
11227719e8b9ff563e6353c62b696705db6cec76428fc4d8015d136b379320743fe5733e64bf0f1e501d0d22b6d797fe39dc8d1da09905aab8f45722b0a80d74

Download Submit
C:\Windows\SysWOW64\topsp.dll

Filesize
235KB

MD5
ef3e1c13e35a82a431a6bd8853fd96fa

SHA1
6c43b3cc8b355c8457d93792f6225aff4d289f7c

SHA256
f902b33f20a0de0ee0e1671715c59c89ffc86fa12d3a8bcd0268d1ee6a8eeb6c

SHA512
f5bb9295fed52d03fb16ad8d11c72634ed991fc27b6c6847a7f48a8b6beebfce890801b83293190b5b4bc4490c6a175902e3f11a3d34f5fa8b93a12a2429e9fb

Download Submit
memory/456-0-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/456-7-0x0000000076980000-0x00000000769FA000-memory.dmp

Filesize
488KB

Download
memory/456-10-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/456-11-0x0000000076980000-0x00000000769FA000-memory.dmp

Filesize
488KB

Download