e5a183ddd621dccbaeecb66e529710bdd129807098502a638ec37165d5f037af

Analysis

max time kernel
7s
max time network
60s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
04/12/2022, 13:19

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General

Target

e5a183ddd621dccbaeecb66e529710bdd129807098502a638ec37165d5f037af.dll
Size

236KB
MD5

fb88d9d4a9d5f5ea4f11bccc53d91011
SHA1

ba5f5c1b0db1c64ba9ea133d7c4cc9621523d093
SHA256

e5a183ddd621dccbaeecb66e529710bdd129807098502a638ec37165d5f037af
SHA512

aa1d4d1fdf439fa73dd99b13d4a9daa66ba1168ba57c1d2192f0398cbcb2591ec76103d646a497c695dc2170f8230c3e07cf7b0d00541278e816be41c229b7d8
SSDEEP

3072:SeqmgHwlaazN9U3J+P0wFp+bLrt2wkkI0:+Qj9U3jwO3rt53

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
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\gyk = "{c040a109-48c8-9d1d-59d9-48c82981c4fc}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
972	rundll32.exe

Drops file in System32 directory 4 IoCs

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

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{c040a109-48c8-9d1d-59d9-48c82981c4fc}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{c040a109-48c8-9d1d-59d9-48c82981c4fc}\InprocServer32\ = "C:\\Windows\\SysWow64\\btf.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{c040a109-48c8-9d1d-59d9-48c82981c4fc}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{c040a109-48c8-9d1d-59d9-48c82981c4fc}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{c040a109-48c8-9d1d-59d9-48c82981c4fc}\	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
972	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	972	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
972	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1532 wrote to memory of 972	1532	rundll32.exe	27
PID 1532 wrote to memory of 972	1532	rundll32.exe	27
PID 1532 wrote to memory of 972	1532	rundll32.exe	27
PID 1532 wrote to memory of 972	1532	rundll32.exe	27
PID 1532 wrote to memory of 972	1532	rundll32.exe	27
PID 1532 wrote to memory of 972	1532	rundll32.exe	27
PID 1532 wrote to memory of 972	1532	rundll32.exe	27

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\e5a183ddd621dccbaeecb66e529710bdd129807098502a638ec37165d5f037af.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1532
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\e5a183ddd621dccbaeecb66e529710bdd129807098502a638ec37165d5f037af.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:972

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\tlx.dll

Filesize
625KB

MD5
95e2376b3323f062eb562b8586d0f14a

SHA1
453d4c3bf4a489433b593420a37bbffb7749875a

SHA256
bd3fa8750123d00aa0967fba44372c46ea002681da9c9b77a4f9261553e26017

SHA512
b898603d07a49237e4dfc6872d5caa7616bae1258926f10e66c4d3f0d81cccefac1e844395b65bb1f308fbc022061b52e51f60658d0a546c04b365b3428cc87d

Download Submit
memory/972-55-0x0000000075201000-0x0000000075203000-memory.dmp

Filesize
8KB

Download
memory/972-58-0x0000000000110000-0x0000000000154000-memory.dmp

Filesize
272KB

Download