b99b94f057a87daba97b296ee4c418e842910307054d9f9af026fe784af2077d

Analysis

max time kernel
40s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
03-10-2022 13:43

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General

Target

b99b94f057a87daba97b296ee4c418e842910307054d9f9af026fe784af2077d.dll
Size

236KB
MD5

60254ff672dc9c0a744661f7709296d8
SHA1

a4f603432f48fe9e6cf25bf9669c382ce0d4f402
SHA256

b99b94f057a87daba97b296ee4c418e842910307054d9f9af026fe784af2077d
SHA512

e77d13d9a8676d51a4b59a9723a447e7fecefab6f8ea787ece755dbb02db8eeddeee1c7e45db4ce210c47f7ff40de0d1ff46a7f696aa50a4b6684dc8a1368ef4
SSDEEP

1536:1dKaTHN2ymZ0ofa5uQm4V7HG8ldINh+RhFtFftCgpcGO5lPf/XG8GmGwktbR:1Y4tIQG8XAmbFfaGc1fawk1R

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

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\niejhljbw = "{b04fb331-38c7-8d1c-49d8-38c73bb96767}"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
1568	rundll32.exe

Drops file in System32 directory 4 IoCs

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

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{b04fb331-38c7-8d1c-49d8-38c73bb96767}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{b04fb331-38c7-8d1c-49d8-38c73bb96767}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{b04fb331-38c7-8d1c-49d8-38c73bb96767}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{b04fb331-38c7-8d1c-49d8-38c73bb96767}\InprocServer32\ = "C:\\Windows\\SysWow64\\idzecgewr.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{b04fb331-38c7-8d1c-49d8-38c73bb96767}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1568	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1568	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1568	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 968 wrote to memory of 1568	968	rundll32.exe	27
PID 968 wrote to memory of 1568	968	rundll32.exe	27
PID 968 wrote to memory of 1568	968	rundll32.exe	27
PID 968 wrote to memory of 1568	968	rundll32.exe	27
PID 968 wrote to memory of 1568	968	rundll32.exe	27
PID 968 wrote to memory of 1568	968	rundll32.exe	27
PID 968 wrote to memory of 1568	968	rundll32.exe	27

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\b99b94f057a87daba97b296ee4c418e842910307054d9f9af026fe784af2077d.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:968
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\b99b94f057a87daba97b296ee4c418e842910307054d9f9af026fe784af2077d.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:1568

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Windows\SysWOW64\avrwuywoj.dll

Filesize
625KB

MD5
95e2376b3323f062eb562b8586d0f14a

SHA1
453d4c3bf4a489433b593420a37bbffb7749875a

SHA256
bd3fa8750123d00aa0967fba44372c46ea002681da9c9b77a4f9261553e26017

SHA512
b898603d07a49237e4dfc6872d5caa7616bae1258926f10e66c4d3f0d81cccefac1e844395b65bb1f308fbc022061b52e51f60658d0a546c04b365b3428cc87d

Download Submit
memory/1568-55-0x0000000076831000-0x0000000076833000-memory.dmp

Filesize
8KB

Download
memory/1568-56-0x0000000000210000-0x0000000000254000-memory.dmp

Filesize
272KB

Download
memory/1568-58-0x0000000000210000-0x0000000000254000-memory.dmp

Filesize
272KB

Download
memory/1568-59-0x0000000000210000-0x0000000000254000-memory.dmp

Filesize
272KB

Download