Analysis
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max time kernel
149s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20230703-en -
resource tags
arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system -
submitted
10-07-2023 13:28
Behavioral task
behavioral1
Sample
FirefoxInstallerexe.exe
Resource
win7-20230703-en
Behavioral task
behavioral2
Sample
FirefoxInstallerexe.exe
Resource
win10v2004-20230703-en
General
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Target
FirefoxInstallerexe.exe
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Size
188KB
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MD5
43797b66dbc85e52db3f9ccbbab6a811
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SHA1
47cb18b091310ad396684f0619261332f1164f8d
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SHA256
6e977411cea076427e903cba32827b2d78202021f62c6b045c1e4a65042e8d15
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SHA512
c50e4c1855c7f44c7d83f650e18cbb05686b85ac993eb828cb8181106dfcf5b4fe732a97839430e44e7ef198dde0e5459a52845ff487597e039e63f4d7561fd5
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SSDEEP
3072:LJZKnPE2YyJzELtyThyYeY8lNgoiJ+sX8HFvytb3NuIMAAcoQntK+C7VieM3SFZK:LJZKBI0hyYeY4eoiJ+sCFvCU/TQwX3Mp
Malware Config
Signatures
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VanillaRat
VanillaRat is an advanced remote administration tool coded in C#.
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Vanilla Rat payload 7 IoCs
Processes:
resource yara_rule behavioral2/memory/4872-133-0x0000000000E10000-0x0000000000E46000-memory.dmp vanillarat C:\Users\Admin\svchost.exe vanillarat C:\Users\Admin\svchost.exe vanillarat C:\Users\Admin\svchost.exe vanillarat behavioral2/memory/1148-164-0x0000000000600000-0x0000000000622000-memory.dmp vanillarat C:\Users\Admin\AppData\Roaming\svchost.exe vanillarat C:\Users\Admin\AppData\Roaming\svchost.exe vanillarat -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
FirefoxInstallerexe.exesvchost.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1043950675-1972537973-2972532878-1000\Control Panel\International\Geo\Nation FirefoxInstallerexe.exe Key value queried \REGISTRY\USER\S-1-5-21-1043950675-1972537973-2972532878-1000\Control Panel\International\Geo\Nation svchost.exe -
Executes dropped EXE 2 IoCs
Processes:
svchost.exesvchost.exepid process 1148 svchost.exe 3344 svchost.exe -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
svchost.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1043950675-1972537973-2972532878-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe" svchost.exe -
Legitimate hosting services abused for malware hosting/C2 1 TTPs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Program crash 1 IoCs
Processes:
WerFault.exepid pid_target process target process 4568 4872 WerFault.exe FirefoxInstallerexe.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
FirefoxInstallerexe.exesvchost.exedescription pid process Token: SeDebugPrivilege 4872 FirefoxInstallerexe.exe Token: SeDebugPrivilege 1148 svchost.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
FirefoxInstallerexe.exesvchost.exedescription pid process target process PID 4872 wrote to memory of 1148 4872 FirefoxInstallerexe.exe svchost.exe PID 4872 wrote to memory of 1148 4872 FirefoxInstallerexe.exe svchost.exe PID 4872 wrote to memory of 1148 4872 FirefoxInstallerexe.exe svchost.exe PID 1148 wrote to memory of 3344 1148 svchost.exe svchost.exe PID 1148 wrote to memory of 3344 1148 svchost.exe svchost.exe PID 1148 wrote to memory of 3344 1148 svchost.exe svchost.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\FirefoxInstallerexe.exe"C:\Users\Admin\AppData\Local\Temp\FirefoxInstallerexe.exe"1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\svchost.exe"C:\Users\Admin\svchost.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"3⤵
- Executes dropped EXE
- Adds Run key to start application
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4872 -s 14922⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4872 -ip 48721⤵
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Roaming\svchost.exeFilesize
115KB
MD5afd5d29bfcddb00b11a869fd2016282d
SHA10de3328c8a0dce66d17765665b29662de75e5d15
SHA25638194b42cc180ab72aed1256447bec9b8b65910241e5a2b97ac29b0c12d95748
SHA512ce3aaf59162768087bbb34de0767c74ee05e8f13a19559c49896f5249d36900ee14270ade74964c8cd3d8b6bcf684002cf3bddc8d14856907d2b2b2d0026f133
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C:\Users\Admin\AppData\Roaming\svchost.exeFilesize
115KB
MD5afd5d29bfcddb00b11a869fd2016282d
SHA10de3328c8a0dce66d17765665b29662de75e5d15
SHA25638194b42cc180ab72aed1256447bec9b8b65910241e5a2b97ac29b0c12d95748
SHA512ce3aaf59162768087bbb34de0767c74ee05e8f13a19559c49896f5249d36900ee14270ade74964c8cd3d8b6bcf684002cf3bddc8d14856907d2b2b2d0026f133
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C:\Users\Admin\svchost.exeFilesize
115KB
MD5afd5d29bfcddb00b11a869fd2016282d
SHA10de3328c8a0dce66d17765665b29662de75e5d15
SHA25638194b42cc180ab72aed1256447bec9b8b65910241e5a2b97ac29b0c12d95748
SHA512ce3aaf59162768087bbb34de0767c74ee05e8f13a19559c49896f5249d36900ee14270ade74964c8cd3d8b6bcf684002cf3bddc8d14856907d2b2b2d0026f133
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C:\Users\Admin\svchost.exeFilesize
115KB
MD5afd5d29bfcddb00b11a869fd2016282d
SHA10de3328c8a0dce66d17765665b29662de75e5d15
SHA25638194b42cc180ab72aed1256447bec9b8b65910241e5a2b97ac29b0c12d95748
SHA512ce3aaf59162768087bbb34de0767c74ee05e8f13a19559c49896f5249d36900ee14270ade74964c8cd3d8b6bcf684002cf3bddc8d14856907d2b2b2d0026f133
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C:\Users\Admin\svchost.exeFilesize
115KB
MD5afd5d29bfcddb00b11a869fd2016282d
SHA10de3328c8a0dce66d17765665b29662de75e5d15
SHA25638194b42cc180ab72aed1256447bec9b8b65910241e5a2b97ac29b0c12d95748
SHA512ce3aaf59162768087bbb34de0767c74ee05e8f13a19559c49896f5249d36900ee14270ade74964c8cd3d8b6bcf684002cf3bddc8d14856907d2b2b2d0026f133
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memory/1148-164-0x0000000000600000-0x0000000000622000-memory.dmpFilesize
136KB
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memory/1148-165-0x0000000005BB0000-0x0000000006154000-memory.dmpFilesize
5.6MB
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memory/1148-166-0x0000000005600000-0x0000000005692000-memory.dmpFilesize
584KB
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memory/1148-167-0x0000000005390000-0x000000000539A000-memory.dmpFilesize
40KB
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memory/4872-133-0x0000000000E10000-0x0000000000E46000-memory.dmpFilesize
216KB