hxxp://sv[.]symcb[.]com/sv[.]crl

General

Target

http://sv.symcb.com/sv.crl
Sample

200214-agpwe2e5y2

Score

6^/10

evasion trojan

Malware Config

Signatures

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

iexplore.exe

description	pid	process	target process
PID 4900 wrote to memory of 4948	4900	iexplore.exe	IEXPLORE.EXE
PID 4900 wrote to memory of 4948	4900	iexplore.exe	IEXPLORE.EXE
PID 4900 wrote to memory of 4948	4900	iexplore.exe	IEXPLORE.EXE
PID 4900 wrote to memory of 2956	4900	iexplore.exe	rundll32.exe
PID 4900 wrote to memory of 2956	4900	iexplore.exe	rundll32.exe

Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

iexplore.exeIEXPLORE.EXE

pid process

4900 iexplore.exe
4900 iexplore.exe
4948 IEXPLORE.EXE
4948 IEXPLORE.EXE
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

iexplore.exe

pid process

4900 iexplore.exe
4900 iexplore.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

rundll32.exe

pid process

2956 rundll32.exe

pid	process
4900	iexplore.exe
4900	iexplore.exe
4948	IEXPLORE.EXE
4948	IEXPLORE.EXE

pid	process
4900	iexplore.exe
4900	iexplore.exe

pid	process
2956	rundll32.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

iexplore.exeIEXPLORE.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	iexplore.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	IEXPLORE.EXE

Modifies Internet Explorer settings 1 TTPs 35 IoCs

adware spyware

Modify Registry

T1112

Processes:

iexplore.exeIEXPLORE.EXE

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\PhishingFilter\ClientSupported_MigrationTime = 4c6bfe76f785d501	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NTPFirstRun = "1"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = 0075ae47f8e2d501	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb0100000008879de68b7c3d499fa6838ecf7b312e000000000200000000001066000000010000200000003257911131f38722f4ada6c053c9d437fd6b96552b5b7267039de175a075d450000000000e80000000020000200000009807f208d0030aa9ed95a68e3faabc02ac1611dc4357e6602ef2efd41de3e2bf20000000adcc2c09b38aa4eced954632973d9cdb99de0d9fdfd0bb1612d061bcc323bcaa40000000e7f544a84d5e3ee04dacad73ff37e426e4749ba9c9d1007e40577ee081af9ab1f53ce7e1858910bbdc69a5daea44fd08fe4b122f9bf610dc9c6f53cd8496a658	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main\DownloadWindowPlacement = 2c00000000000000000000000083ffff0083ffffffffffffffffffff100100003c000000900300001c020000	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\RepId	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastUpdateLowDateTime = "1159048085"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{703B9878-4EEB-11EA-BD7F-5E9D90D68279} = "0"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\PhishingFilter	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\MINIE	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastUpdateHighDateTime = "30794488"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "1159048085"	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\DecayDateQueue = 01000000d08c9ddf0115d1118c7a00c04fc297eb0100000008879de68b7c3d499fa6838ecf7b312e00000000020000000000106600000001000020000000253ce33b06d9a59223a750a048dbec3a44af465289a6abae5fd98ee7b78a4912000000000e800000000200002000000013a520ec3ef323c89e59260a24c63d7ecc2465549dd907c82e0d431338a8cd5620000000f80ee7924927d1c648bd308f1b650aa25b22538b87511c5efacd6e2b7abd2a1040000000a8bae6a5567c69ce9507bf6e0e2f4a7ae05bfb3237ca8f140fea0f7697f1f8f9463c3529be5378efcb61ea8ec6b8cb347b6da9f6132a8a231e307bc4cdc70b24	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\MINIE\TabBandWidth = "500"	iexplore.exe
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastTTLLowDateTime = "1251635200"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastTTLHighDateTime = "50"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateLowDateTime = "1191213421"	IEXPLORE.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30794488"	IEXPLORE.EXE
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage	iexplore.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\TabbedBrowsing\NewTabPage\LastProcessed = b06ecd47f8e2d501	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\RepId\PublicId = "{76FE6217-E714-43AD-852F-0BE5FD873908}"	iexplore.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000\Software\Microsoft\Internet Explorer\VersionManager\LastCheckForUpdateHighDateTime = "30794488"	iexplore.exe

Modifies registry class 1 IoCs

Processes:

iexplore.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000_Classes\Local Settings iexplore.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-634046074-2673730973-2644684987-1000_Classes\Local Settings	iexplore.exe

C:\Program Files\Internet Explorer\iexplore.exe
"C:\Program Files\Internet Explorer\iexplore.exe" http://sv.symcb.com/sv.crl
1⤵
- Suspicious use of WriteProcessMemory
- Suspicious use of SetWindowsHookEx
- Suspicious use of FindShellTrayWindow
- Checks whether UAC is enabled
- Modifies Internet Explorer settings
- Modifies registry class
PID:4900

C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
"C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:4900 CREDAT:82945 /prefetch:2
2⤵
- Suspicious use of SetWindowsHookEx
- Checks whether UAC is enabled
- Modifies Internet Explorer settings
PID:4948

C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" cryptext.dll,CryptExtOpenCRL C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\89TS8EPW\sv.crl
2⤵
- Suspicious behavior: GetForegroundWindowSpam
PID:2956

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\6BADA8974A10C4BD62CC921D13E43B18_D9817BD5013875AD517DA73475345203

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\6BADA8974A10C4BD62CC921D13E43B18_D9817BD5013875AD517DA73475345203

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\89TS8EPW\sv.crl.bu9imca.partial

Download Submit

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads