Analysis
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max time kernel
40s -
max time network
44s -
platform
windows7_x64 -
resource
win7-20230220-en -
resource tags
arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system -
submitted
23-02-2023 16:02
Behavioral task
behavioral1
Sample
c09b509699aeef71f3e205d53c5f4ff71cb48570.dll
Resource
win7-20230220-en
Behavioral task
behavioral2
Sample
c09b509699aeef71f3e205d53c5f4ff71cb48570.dll
Resource
win10v2004-20230221-en
General
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Target
c09b509699aeef71f3e205d53c5f4ff71cb48570.dll
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Size
77KB
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MD5
0aacf2c41ba9b872a52055ffcaeaef15
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SHA1
c09b509699aeef71f3e205d53c5f4ff71cb48570
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SHA256
31630d16f4564c7a214a206a58f60b7623cd1b3abb823d10ed50aa077ca33585
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SHA512
d259de51d22d72d27d5947530317661b97ba8fcc36e7a2ad4835e98bc311ef1aa5964f939660733171934f6aefa82d8b76a6f9f04137e1aeca63d592f0fb26ec
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SSDEEP
1536:rADwfmySY6FIsr4XSZ32tcOGwpin2NI2F4cd:UDwTF6+srGi32tcOGwpin2NMcd
Malware Config
Extracted
C:\MSOCache\All Users\{90140000-001A-0409-0000-0000000FF1CE}-C\RecoveryManual.html
Extracted
C:\Users\Admin\Desktop\RecoveryManual.html
mountlocker
http://qiludmxlqqotacf62iycexcohbka4ezresf5jmwdoh7iyk3tgguzaaqd.onion/?cid=d11ebd6225c2dd096733ff8dad28b64333d3957fd7b47717abe00375993d6d61
Signatures
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MountLocker Ransomware
Ransomware family first seen in late 2020, which threatens to leak files if ransom is not paid.
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies extensions of user files 28 IoCs
Ransomware generally changes the extension on encrypted files.
description ioc Process File renamed C:\Users\Admin\Pictures\ConvertToClose.png => \??\c:\Users\Admin\Pictures\ConvertToClose.png.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\GrantWait.crw => \??\c:\Users\Admin\Pictures\GrantWait.crw.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\RequestFind.png => \??\c:\Users\Admin\Pictures\RequestFind.png.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\RevokeCompress.crw => \??\c:\Users\Admin\Pictures\RevokeCompress.crw.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\ConvertToClose.png.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\DebugLock.tif => \??\c:\Users\Admin\Pictures\DebugLock.tif.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\GrantWait.crw.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\InvokeWrite.crw => \??\c:\Users\Admin\Pictures\InvokeWrite.crw.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\RequestFind.png.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\InvokeWrite.crw.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\RemoveEnable.tiff.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\ResetTrace.crw.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\ResolveEnable.tiff => \??\c:\Users\Admin\Pictures\ResolveEnable.tiff.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\WaitInitialize.png.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\ReadConvertFrom.tiff.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\ResolveEnable.tiff.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\InstallRegister.tif => \??\c:\Users\Admin\Pictures\InstallRegister.tif.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\SearchConvert.crw => \??\c:\Users\Admin\Pictures\SearchConvert.crw.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\SearchConvert.crw.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\InstallRegister.tif.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\ReadConvertFrom.tiff => \??\c:\Users\Admin\Pictures\ReadConvertFrom.tiff.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\RemoveEnable.tiff => \??\c:\Users\Admin\Pictures\RemoveEnable.tiff.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\WaitInitialize.png => \??\c:\Users\Admin\Pictures\WaitInitialize.png.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\DebugLock.tif.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\LimitRename.tif => \??\c:\Users\Admin\Pictures\LimitRename.tif.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\LimitRename.tif.ReadManual.64BD3273 regsvr32.exe File renamed C:\Users\Admin\Pictures\ResetTrace.crw => \??\c:\Users\Admin\Pictures\ResetTrace.crw.ReadManual.64BD3273 regsvr32.exe File opened for modification \??\c:\Users\Admin\Pictures\RevokeCompress.crw.ReadManual.64BD3273 regsvr32.exe -
Deletes itself 1 IoCs
pid Process 1544 cmd.exe -
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 296 vssadmin.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\IntelliForms iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Toolbar iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\IETld\LowMic iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\LowRegistry iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive\{EDF64561-B39B-11ED-B883-CED2106B5FC8} = "0" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\FullScreen = "no" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main IEXPLORE.EXE Set value (str) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" IEXPLORE.EXE Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\LowRegistry\DontShowMeThisDialogAgain iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\PageSetup iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0" iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Main iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\BrowserEmulation\LowMic iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\GPU iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\InternetRegistry iexplore.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Zoom iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0" iexplore.exe -
Modifies registry class 5 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000_CLASSES\.64BD3273\shell\Open\command regsvr32.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000_CLASSES\.64BD3273 regsvr32.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000_CLASSES\.64BD3273\shell regsvr32.exe Key created \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000_CLASSES\.64BD3273\shell\Open regsvr32.exe Set value (str) \REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000_CLASSES\.64BD3273\shell\Open\command\ = "explorer.exe RecoveryManual.html" regsvr32.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 1980 regsvr32.exe 1980 regsvr32.exe -
Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 1980 regsvr32.exe Token: SeBackupPrivilege 1800 vssvc.exe Token: SeRestorePrivilege 1800 vssvc.exe Token: SeAuditPrivilege 1800 vssvc.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 1612 iexplore.exe -
Suspicious use of SetWindowsHookEx 6 IoCs
pid Process 1612 iexplore.exe 1612 iexplore.exe 1292 IEXPLORE.EXE 1292 IEXPLORE.EXE 1292 IEXPLORE.EXE 1292 IEXPLORE.EXE -
Suspicious use of WriteProcessMemory 23 IoCs
description pid Process procid_target PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1968 wrote to memory of 1980 1968 regsvr32.exe 28 PID 1980 wrote to memory of 296 1980 regsvr32.exe 30 PID 1980 wrote to memory of 296 1980 regsvr32.exe 30 PID 1980 wrote to memory of 296 1980 regsvr32.exe 30 PID 1980 wrote to memory of 296 1980 regsvr32.exe 30 PID 1980 wrote to memory of 1544 1980 regsvr32.exe 32 PID 1980 wrote to memory of 1544 1980 regsvr32.exe 32 PID 1980 wrote to memory of 1544 1980 regsvr32.exe 32 PID 1980 wrote to memory of 1544 1980 regsvr32.exe 32 PID 1544 wrote to memory of 1940 1544 cmd.exe 34 PID 1544 wrote to memory of 1940 1544 cmd.exe 34 PID 1544 wrote to memory of 1940 1544 cmd.exe 34 PID 1544 wrote to memory of 1940 1544 cmd.exe 34 PID 1612 wrote to memory of 1292 1612 iexplore.exe 38 PID 1612 wrote to memory of 1292 1612 iexplore.exe 38 PID 1612 wrote to memory of 1292 1612 iexplore.exe 38 PID 1612 wrote to memory of 1292 1612 iexplore.exe 38 -
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
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Views/modifies file attributes 1 TTPs 1 IoCs
pid Process 1940 attrib.exe
Processes
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C:\Windows\system32\regsvr32.exeregsvr32 /s C:\Users\Admin\AppData\Local\Temp\c09b509699aeef71f3e205d53c5f4ff71cb48570.dll1⤵
- Suspicious use of WriteProcessMemory
PID:1968 -
C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\c09b509699aeef71f3e205d53c5f4ff71cb48570.dll2⤵
- Modifies extensions of user files
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1980 -
C:\Windows\SysWOW64\vssadmin.exeC:\Windows\system32\vssadmin.exe delete shadows /all /Quiet3⤵
- Interacts with shadow copies
PID:296
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C:\Windows\SysWOW64\cmd.execmd /c ""C:\Users\Admin\AppData\Local\Temp\\006C5024.bat" "C:\Users\Admin\AppData\Local\Temp\c09b509699aeef71f3e205d53c5f4ff71cb48570.dll""3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:1544 -
C:\Windows\SysWOW64\attrib.exeattrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\c09b509699aeef71f3e205d53c5f4ff71cb48570.dll"4⤵
- Views/modifies file attributes
PID:1940
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1800
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C:\Program Files\Internet Explorer\iexplore.exe"C:\Program Files\Internet Explorer\iexplore.exe" C:\Users\Admin\Desktop\RecoveryManual.html1⤵
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1612 -
C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE"C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:1612 CREDAT:275457 /prefetch:22⤵
- Modifies Internet Explorer settings
- Suspicious use of SetWindowsHookEx
PID:1292
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
2KB
MD5e422994ea7cde5c21aa00572c2cd19f2
SHA1278c11d9f9238906cbea95df932f3d0757ac7e66
SHA256d0ff34e5a7bf02dfc44812970bea5cc598393fde921df69593c9521006a55229
SHA512eee145c38bd66df1d7d6921ccb59aef24ee8271c0618f523df0c0738eaad54b1cb9c48ebe9384a2075ade9bbf3f235fe27efd019fc19ed14b7efc1c1920f57cb
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Filesize
65B
MD5348cae913e496198548854f5ff2f6d1e
SHA1a07655b9020205bd47084afd62a8bb22b48c0cdc
SHA256c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506
SHA512799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611
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Filesize
65B
MD5348cae913e496198548854f5ff2f6d1e
SHA1a07655b9020205bd47084afd62a8bb22b48c0cdc
SHA256c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506
SHA512799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611
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Filesize
2KB
MD5e422994ea7cde5c21aa00572c2cd19f2
SHA1278c11d9f9238906cbea95df932f3d0757ac7e66
SHA256d0ff34e5a7bf02dfc44812970bea5cc598393fde921df69593c9521006a55229
SHA512eee145c38bd66df1d7d6921ccb59aef24ee8271c0618f523df0c0738eaad54b1cb9c48ebe9384a2075ade9bbf3f235fe27efd019fc19ed14b7efc1c1920f57cb