8109b2fe6fe61eec679d059c1e553c20777dde2b6b8200ce3bdf57b2f2068bf5

Analysis

max time kernel
94s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
20/09/2024, 03:48

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General

Target

Assist/$R0.dll
Size

156KB
MD5

aaf5a6b61ca11868c31011a68d95a5ef
SHA1

d58bb83332af9e56758ff5cb1fcd3173567e6c4c
SHA256

a8cd1c0f58135ad104b0d2a3064d3d4b9792be5ff40a721aac7eb37e26708b36
SHA512

e6461950958a38089197932f6ba34b578a6d6932e1cf7412a2c93f5841e853468037c0cd2081d3ef5f744ab04df7b8b967113aa255066a1f22ae980dc6ceca3b
SSDEEP

3072:rLUxXZ6+a0acTJyxc+avp3U0S96yM33fJgqVfuO8LLx14:cxZ6/cNSKd7r33VfVA

Score

6^/10

adware discovery stealer

Malware Config

Signatures

Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

BHOs are DLL modules which act as plugins for Internet Explorer.

stealer adware

Modify Registry

T1112

Browser Extensions

T1176

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{BB936323-19FA-4521-BA29-ECA6A121BC78}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{BB936323-19FA-4521-BA29-ECA6A121BC78}\ = "AssistII"	regsvr32.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	regsvr32.exe

Modifies Internet Explorer settings 1 TTPs 6 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\Software\Microsoft\Internet Explorer\URLSearchHooks	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Internet Explorer\URLSearchHooks\{BB936323-19FA-4521-BA29-ECA6A121BC78} = "coolbar"	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Internet Explorer\URLSearchHooks\{CFBFAE00-17A6-11D0-99CB-00C04FD64497}	regsvr32.exe
Key deleted	\REGISTRY\USER\S-1-5-21-2412658365-3084825385-3340777666-1000\SOFTWARE\Microsoft\Internet Explorer\Toolbar\WebBrowser	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Internet Explorer\Toolbar	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Internet Explorer\Toolbar\{BB936323-19FA-4521-BA29-ECA6A121BC78} = "????"	regsvr32.exe

Modifies registry class 46 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\TypeLib\ = "{D4839331-534D-4D0C-875F-D25AF6A10CCC}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\ = "IToolBandObj"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\0	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\0\win32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj.1\ = "ÉÏÍøÖúÊÖ"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj\CLSID	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\VersionIndependentProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Assist\\$R0.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\TypeLib\Version = "1.0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\ = "ÉÏÍøÖúÊÖ"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\InprocServer32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\TypeLib	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj.1	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj\ = "ÉÏÍøÖúÊÖ"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj\CurVer	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\ProxyStubClsid32\ = "{00020424-0000-0000-C000-000000000046}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\TypeLib	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\0\win32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Assist\\$R0.dll"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\HELPDIR	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\ProxyStubClsid32	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\Programmable	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\ = "IToolBandObj"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj.1\CLSID\ = "{BB936323-19FA-4521-BA29-ECA6A121BC78}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj\CLSID\ = "{BB936323-19FA-4521-BA29-ECA6A121BC78}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj\CurVer\ = "CoolBar.CoolBarObj.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\ProgID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\ = "CoolBar 1.0 Type Library"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\FLAGS\ = "0"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\HELPDIR\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Assist\\"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\TypeLib\ = "{D4839331-534D-4D0C-875F-D25AF6A10CCC}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CoolBar.CoolBarObj.1\CLSID	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\VersionIndependentProgID\ = "CoolBar.CoolBarObj"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\InprocServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BB936323-19FA-4521-BA29-ECA6A121BC78}\ProgID\ = "CoolBar.CoolBarObj.1"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\TypeLib\{D4839331-534D-4D0C-875F-D25AF6A10CCC}\1.0\FLAGS	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\Interface\{7436DB12-1A7A-4D87-A4E0-713EC9D86050}\TypeLib\ = "{D4839331-534D-4D0C-875F-D25AF6A10CCC}"	regsvr32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2160 wrote to memory of 4800	2160	regsvr32.exe	82
PID 2160 wrote to memory of 4800	2160	regsvr32.exe	82
PID 2160 wrote to memory of 4800	2160	regsvr32.exe	82

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\Assist\$R0.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:2160
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\Assist\$R0.dll
  2⤵
  - Installs/modifies Browser Helper Object
  - System Location Discovery: System Language Discovery
  - Modifies Internet Explorer settings
  - Modifies registry class
  PID:4800

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Browser Extensions

T1176

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Assist\3721\Coolbar\1.bmp

Filesize
604B

MD5
797a7955e4869d421f672cd2e5fb6bde

SHA1
4120908d501ad837286cafedc8cd8096dc2b6364

SHA256
f251946827b8ed34e1cf1909b1a0a68ab8a6a378a2043753c93b9156a781908e

SHA512
5aaaa681d6bf2aa88224c4884c739a325ba6d5d4cc2e668fe85910c5db1ab58bafceafc8478c050084c90a5c7d3a58e81939c1bb3aa18ffd4512a0ff3cb84002

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads