Analysis
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max time kernel
150s -
max time network
46s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
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submitted
16-11-2022 10:01
General
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Target
medusa.exe
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Size
719KB
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MD5
8474039d83805eb7b447325c3a8d1ebb
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SHA1
a07d537f4253745a087709a9a07c449f84deed8d
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SHA256
b2493a580153291b69ca23190d00a00b1220cd0aadf469b3974fdaa726516649
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SHA512
3272091bbf123ba5e1592e8b2bd7740cddcb174fa158bc6980b25ee61d92387e94a25284736253f83a6eea78b427f6717e888e843db9d7759cfe9a7676576438
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SSDEEP
12288:q4UOTYQivI2qZ7aSgLwkFVpzUvest4ZEbjJLuhJVoM7SPd:bRTYVQ2qZ7aSgLwuVfstRJL6YM6
Malware Config
Extracted
C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\Recovery_Instructions.html
href="[email protected]">[email protected]</a>
href="[email protected]">[email protected]</a>
Signatures
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MedusaLocker
Ransomware with several variants first seen in September 2019.
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MedusaLocker payload 6 IoCs
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Modifies system executable filetype association 2 TTPs 1 IoCs
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Neshta
Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.
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UAC bypass 3 TTPs 2 IoCs
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Executes dropped EXE 2 IoCs
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Modifies extensions of user files 12 IoCs
Ransomware generally changes the extension on encrypted files.
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Loads dropped DLL 3 IoCs
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Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Checks whether UAC is enabled 1 TTPs 1 IoCs
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Drops desktop.ini file(s) 1 IoCs
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Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
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Drops file in Program Files directory 64 IoCs
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Drops file in Windows directory 1 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
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Modifies registry class 1 IoCs
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Suspicious behavior: EnumeratesProcesses 64 IoCs
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Suspicious use of AdjustPrivilegeToken 63 IoCs
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Suspicious use of WriteProcessMemory 32 IoCs
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System policy modification 1 TTPs 3 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\medusa.exe"C:\Users\Admin\AppData\Local\Temp\medusa.exe"1⤵
- Modifies system executable filetype association
- Loads dropped DLL
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\3582-490\medusa.exe"C:\Users\Admin\AppData\Local\Temp\3582-490\medusa.exe"2⤵
- UAC bypass
- Executes dropped EXE
- Modifies extensions of user files
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet3⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive3⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet3⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive3⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\vssadmin.exevssadmin.exe Delete Shadows /All /Quiet3⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\Wbem\wmic.exewmic.exe SHADOWCOPY /nointeractive3⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\taskeng.exetaskeng.exe {3CE7722E-98D6-4509-AACB-4CB8D9A0F9D7} S-1-5-21-2292972927-2705560509-2768824231-1000:GRXNNIIE\Admin:Interactive:[1]1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\svhost.exeC:\Users\Admin\AppData\Roaming\svhost.exe2⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
864KB
MD52c1f43649ea7e7bb1c46eba33f38b085
SHA1b0a514764ad8d5dba68e509075f4b84e6b38fcd0
SHA256436d673b1784f0fc5f66b1b6ea03112997f7b629422955a5d7465c1788a8042d
SHA5129638bdeabc285afd3fd1e6cba8b362811fe5cc0a7276a4c12aeb8af65011530b050f7e89af4dda84fff0dcfeb52613a9815d55dea8af347dcedd7765f591b60e
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Filesize
678KB
MD55aa0a571567f8437556e9b00ae5a3532
SHA145377cb152832c9112db7909219fa87a6e760aae
SHA25673549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
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Filesize
678KB
MD55aa0a571567f8437556e9b00ae5a3532
SHA145377cb152832c9112db7909219fa87a6e760aae
SHA25673549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
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Filesize
678KB
MD55aa0a571567f8437556e9b00ae5a3532
SHA145377cb152832c9112db7909219fa87a6e760aae
SHA25673549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
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Filesize
678KB
MD55aa0a571567f8437556e9b00ae5a3532
SHA145377cb152832c9112db7909219fa87a6e760aae
SHA25673549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
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Filesize
252KB
MD59e2b9928c89a9d0da1d3e8f4bd96afa7
SHA1ec66cda99f44b62470c6930e5afda061579cde35
SHA2568899b4ed3446b7d55b54defbc1acb7c5392a4b3bc8ec2cdc7c31171708965043
SHA5122ca5ad1d0e12a8049de885b90b7f56fe77c868e0d6dae4ec4b6f3bc0bf7b2e73295cc9b1328c2b45357ffb0d7804622ab3f91a56140b098e93b691032d508156
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Filesize
678KB
MD55aa0a571567f8437556e9b00ae5a3532
SHA145377cb152832c9112db7909219fa87a6e760aae
SHA25673549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
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Filesize
678KB
MD55aa0a571567f8437556e9b00ae5a3532
SHA145377cb152832c9112db7909219fa87a6e760aae
SHA25673549f6017ad04e475e40e9d306b3e042d080843d8e7c029a5bb6b8ab7e34432
SHA512d320fecef75b4514b9cf154d41c3cc03e2cd8f6bf15ff0d7c97398127c0728cf0b24e5a46435573d38b384b1515876070f28daa7d37e81de10d1db2b27ae51ec
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Filesize
8KB