cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8

Analysis

max time kernel
98s
max time network
144s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
18/09/2022, 23:48

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General

Target

cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Size

179KB
MD5

fc150e461355f607bcda8439f4e8ac6c
SHA1

fd8cdf427c8e6d064789d4c7ece1a3da47fb567c
SHA256

cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8
SHA512

578cd5b6fcfa7654152fef797649b602045e7f824f9acb421a6a590f13a7580a286b36545bc83a59f316405d36ee6b09743609a84dac49bc34823d7435f1e8f3
SSDEEP

3072:sFPzNvmJoIKpcDggzKtmPZzCKQsf4PIaNrr/yWTo9CjNxlqr9AjiRSzwWI8ZNq4J:sbcY0KtAYKQsirNrTyW89EaEiRSzwWI0

Score

7^/10

adware discovery persistence stealer

Malware Config

Signatures

Loads dropped DLL 2 IoCs

pid	Process
1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe

Adds Run key to start application 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\Run\tsryxtztiovlqj = "C:\\Windows\\System32\\regsvr32.exe /s \"C:\\Users\\Admin\\AppData\\Local\\Temp\\rsmnekdatelzqe.DLL\""	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\tsryxtztiovlqj = "C:\\Windows\\System32\\regsvr32.exe /s \"C:\\Windows\\system32\\rsmnekdatelzqe.dll\""	regsvr32.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Installs/modifies Browser Helper Object 2 TTPs 4 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\{FE99802E-B060-3889-0613-0B6B23EAC703}	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{FE99802E-B060-3889-0613-0B6B23EAC703}\NoExplorer = "1"	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{FE99802E-B060-3889-0613-0B6B23EAC703}	regsvr32.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{FE99802E-B060-3889-0613-0B6B23EAC703}\NoExplorer = "1"	regsvr32.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\peyfsyigemevkz.exe	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 35 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = f04f0877cccbd801	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\MFV = 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	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\en-US = "en-US.1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\LowMic	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\IETld\LowMic	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\IntelliForms	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\MINIE\TabBandWidth = "500"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\DomainSuggestion	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\GPU	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\LowRegistry	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\NextUpdateDate = "370318139"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Toolbar	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{9CF572B1-37BF-11ED-8F62-626C2AE6DC56} = "0"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb01000000e0f3d159765a7f43b6bf060b4b70c9a300000000020000000000106600000001000020000000b8ebf490b7e0ecc7a250710f313885bab22265f7df6647a15d5bffa1a2a19345000000000e8000000002000020000000225216f9569f0b129635eb6fe626c5894cd76deb97c198688de789cd241a6fea200000000d45d9ae955a2687d317843681c87dc1c8a2dcb89bf50f71015c6a67eb07705c4000000066cf645aee9da2a97e21fe570051b05b101921f2b11833642f9b6f48d568e2cbacf35307be757bf080299e27af521b2c3ce5e59573cfed0410f032c0cbc46fb7	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\LowRegistry\DontShowMeThisDialogAgain	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\PageSetup	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\Zoom	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\MINIE	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\DomainSuggestion\FileNames\	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\InternetRegistry	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing	iexplore.exe

Modifies registry class 10 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\ = "du-little browser enhancer"	regsvr32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\InProcServer32\ThreadingModel = "Apartment"	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\rsmnekdatelzqe.DLL"	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\InProcServer32\ = "C:\\Windows\\SysWow64\\rsmnekdatelzqe.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\ = "du-little browser enhancer"	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\InProcServer32	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\InProcServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FE99802E-B060-3889-0613-0B6B23EAC703}\InProcServer32\ThreadingModel = "Apartment"	regsvr32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1724	iexplore.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
1724	iexplore.exe
1724	iexplore.exe
600	IEXPLORE.EXE
600	IEXPLORE.EXE

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1660 wrote to memory of 1400	1660	cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe	28
PID 1724 wrote to memory of 600	1724	iexplore.exe	31
PID 1724 wrote to memory of 600	1724	iexplore.exe	31
PID 1724 wrote to memory of 600	1724	iexplore.exe	31
PID 1724 wrote to memory of 600	1724	iexplore.exe	31

C:\Users\Admin\AppData\Local\Temp\cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe
"C:\Users\Admin\AppData\Local\Temp\cb83b4209be9860026907e98e13882cc2bd83c7268751c7a48930eeeb562f1d8.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Installs/modifies Browser Helper Object
- Drops file in System32 directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1660
- C:\Windows\SysWOW64\regsvr32.exe
  "C:\Windows\system32\regsvr32.exe" /s "C:\Windows\system32\rsmnekdatelzqe.dll"
  2⤵
  - Adds Run key to start application
  - Installs/modifies Browser Helper Object
  - Modifies registry class
  PID:1400

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" -Embedding
1⤵
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1724
- C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
  "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1724 CREDAT:275457 /prefetch:2
  2⤵
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:600

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Browser Extensions

T1176

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Cookies\Z6OTG2LK.txt

Filesize
608B

MD5
83070ecff3a65893cc3f0d691401cd3e

SHA1
a07fc6aae8d5c6b527c1b8bf2dc779dca39f125e

SHA256
b51aad4cfa4a9200b67288721324c0f9f093fa7c9b6d234f6df83f10c3d4b00c

SHA512
87fa525e793788b8ce887b7cfdccefab7a2f402dcb90c980c35513c573b4deff2f00268aa953101e6715c4c5cc182428a74719d6f405fb6464ec68825c49cdeb

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

Filesize
296KB

MD5
cde81b9cbbad2ed951b041e2150f641d

SHA1
2aa6fff5e9c48b3b5fa057162fafe7a4699d411c

SHA256
24f8596e5473c3b6d4f243d2e9a26a0c5eb893d668ba4b2004f2af9ed090b7e7

SHA512
bb0acf09b3d76ed0729bb738e7cb6b8c14a28991467fb11dcb5c5c4f3d0deb6e80f7f45e2ee2d8032045c195812dac211d63499cc56bcd3664627c1bd55ebb98

Download Submit
\Users\Admin\AppData\Local\Temp\nstF441.tmp\System.dll

Filesize
11KB

MD5
68edaafef887c72f0d85d4d64b6cbf52

SHA1
77c1fb3301d6eea2e882bc387af1a017678c58da

SHA256
7d8ce82f2b89f544ed90cc8febfcfa57b32d2c8600bb77f79bc8d8980f0f7477

SHA512
e1e6b45fd47553d8e72cf15faa8572d6cf3f0a5495a34f7cb63a2307502282e69d482db42f8a760feaa890a0dc9539e9661fea8179e4d6e18e1c90092b06d4b9

Download Submit
\Users\Admin\AppData\Local\Temp\rsmnekdatelzqe.dll

Filesize
296KB

MD5
cde81b9cbbad2ed951b041e2150f641d

SHA1
2aa6fff5e9c48b3b5fa057162fafe7a4699d411c

SHA256
24f8596e5473c3b6d4f243d2e9a26a0c5eb893d668ba4b2004f2af9ed090b7e7

SHA512
bb0acf09b3d76ed0729bb738e7cb6b8c14a28991467fb11dcb5c5c4f3d0deb6e80f7f45e2ee2d8032045c195812dac211d63499cc56bcd3664627c1bd55ebb98

Download Submit
memory/1660-54-0x0000000075FB1000-0x0000000075FB3000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads