Analysis
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max time kernel
92s -
max time network
146s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
03-08-2024 11:31
Behavioral task
behavioral1
Sample
letsvpn-latest.exe
Resource
win7-20240704-en
Behavioral task
behavioral2
Sample
letsvpn-latest.exe
Resource
win10v2004-20240802-en
General
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Target
letsvpn-latest.exe
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Size
16.0MB
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MD5
e1cf9a756ff25d917ebd93319557a2cf
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SHA1
cd4a308890f0c340d941d28e402e0d12e4757e47
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SHA256
c23bb815c8dbf7f0717743954374b33d0f4d8b0ea38ff9f04277db91b10c31b2
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SHA512
74ca44d3993c49a456eca174af216357910ee1b99861f6ffd84906831c802e34a0cc7d8b571e6cd4d9c99b83ff8a89c3c3e57d2b7f2790f17963f11fb0928932
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SSDEEP
393216:cMVhKO2IhWbf5F7Dt5KOZAMIXVyZtXrBuMgpx1W+k0DM:cMf2Iy5F7DmOCMPtBuPzW+
Malware Config
Signatures
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FatalRat
FatalRat is a modular infostealer family written in C++ first appearing in June 2021.
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Fatal Rat payload 1 IoCs
Processes:
resource yara_rule behavioral2/memory/3240-75-0x0000000010000000-0x000000001002A000-memory.dmp fatalrat -
Processes:
resource yara_rule behavioral2/files/0x0007000000023510-27.dat aspack_v212_v242 -
Executes dropped EXE 6 IoCs
Processes:
sg.tmpubc.exeQTalk.exespolsvt.exespolsvt.exesvcoth.exepid Process 4100 sg.tmp 3000 ubc.exe 2144 QTalk.exe 3968 spolsvt.exe 3240 spolsvt.exe 2868 svcoth.exe -
Processes:
resource yara_rule behavioral2/memory/4892-0-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/1504-7-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/1504-9-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/4892-93-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/448-118-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/4892-121-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/4708-119-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/4708-123-0x0000000000400000-0x0000000000562000-memory.dmp upx behavioral2/memory/448-125-0x0000000000400000-0x0000000000562000-memory.dmp upx -
Adds Run key to start application 2 TTPs 1 IoCs
Processes:
ubc.exedescription ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Çý¶¯ÈËÉú = "C:\\Users\\Public\\Documents\\sougou\\PTvrst.exe" ubc.exe -
Processes:
ubc.exedescription ioc Process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA ubc.exe -
Suspicious use of SetThreadContext 3 IoCs
Processes:
QTalk.exespolsvt.exedescription pid Process procid_target PID 2144 set thread context of 3968 2144 QTalk.exe 93 PID 3968 set thread context of 3240 3968 spolsvt.exe 94 PID 3968 set thread context of 2868 3968 spolsvt.exe 95 -
Drops file in Program Files directory 4 IoCs
Processes:
sg.tmpdescription ioc Process File created C:\Program Files (x86)\Common Files\letsvpn-latest.exe sg.tmp File opened for modification C:\Program Files (x86)\Common Files\letsvpn-latest.exe sg.tmp File created C:\Program Files (x86)\Common Files\ubc.exe sg.tmp File opened for modification C:\Program Files (x86)\Common Files\ubc.exe sg.tmp -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 9 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
Processes:
letsvpn-latest.exeletsvpn-latest.exespolsvt.exesvcoth.exeletsvpn-latest.exeubc.exeQTalk.exespolsvt.exeletsvpn-latest.exedescription ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language letsvpn-latest.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language letsvpn-latest.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language spolsvt.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language svcoth.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language letsvpn-latest.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language ubc.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language QTalk.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language spolsvt.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language letsvpn-latest.exe -
Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
spolsvt.exedescription ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 spolsvt.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz spolsvt.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
Processes:
letsvpn-latest.exespolsvt.exepid Process 4892 letsvpn-latest.exe 4892 letsvpn-latest.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe 3240 spolsvt.exe -
Suspicious use of AdjustPrivilegeToken 35 IoCs
Processes:
letsvpn-latest.exeletsvpn-latest.exesg.tmpspolsvt.exeletsvpn-latest.exeletsvpn-latest.exedescription pid Process Token: SeBackupPrivilege 4892 letsvpn-latest.exe Token: SeRestorePrivilege 4892 letsvpn-latest.exe Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: SeCreateGlobalPrivilege 4892 letsvpn-latest.exe Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: SeBackupPrivilege 1504 letsvpn-latest.exe Token: SeRestorePrivilege 1504 letsvpn-latest.exe Token: 33 1504 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 1504 letsvpn-latest.exe Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: SeRestorePrivilege 4100 sg.tmp Token: 35 4100 sg.tmp Token: SeSecurityPrivilege 4100 sg.tmp Token: SeSecurityPrivilege 4100 sg.tmp Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: SeDebugPrivilege 3240 spolsvt.exe Token: SeDebugPrivilege 4892 letsvpn-latest.exe Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: 33 4892 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4892 letsvpn-latest.exe Token: SeBackupPrivilege 4708 letsvpn-latest.exe Token: SeRestorePrivilege 4708 letsvpn-latest.exe Token: 33 4708 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 4708 letsvpn-latest.exe Token: SeBackupPrivilege 448 letsvpn-latest.exe Token: SeRestorePrivilege 448 letsvpn-latest.exe Token: 33 448 letsvpn-latest.exe Token: SeIncBasePriorityPrivilege 448 letsvpn-latest.exe -
Suspicious use of SetWindowsHookEx 4 IoCs
Processes:
ubc.exeQTalk.exepid Process 3000 ubc.exe 3000 ubc.exe 2144 QTalk.exe 2144 QTalk.exe -
Suspicious use of WriteProcessMemory 50 IoCs
Processes:
letsvpn-latest.exeubc.exeQTalk.exespolsvt.exeletsvpn-latest.exeletsvpn-latest.exedescription pid Process procid_target PID 4892 wrote to memory of 1896 4892 letsvpn-latest.exe 84 PID 4892 wrote to memory of 1896 4892 letsvpn-latest.exe 84 PID 4892 wrote to memory of 1504 4892 letsvpn-latest.exe 87 PID 4892 wrote to memory of 1504 4892 letsvpn-latest.exe 87 PID 4892 wrote to memory of 1504 4892 letsvpn-latest.exe 87 PID 4892 wrote to memory of 4100 4892 letsvpn-latest.exe 88 PID 4892 wrote to memory of 4100 4892 letsvpn-latest.exe 88 PID 4892 wrote to memory of 4100 4892 letsvpn-latest.exe 88 PID 4892 wrote to memory of 3000 4892 letsvpn-latest.exe 90 PID 4892 wrote to memory of 3000 4892 letsvpn-latest.exe 90 PID 4892 wrote to memory of 3000 4892 letsvpn-latest.exe 90 PID 3000 wrote to memory of 2144 3000 ubc.exe 92 PID 3000 wrote to memory of 2144 3000 ubc.exe 92 PID 3000 wrote to memory of 2144 3000 ubc.exe 92 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 2144 wrote to memory of 3968 2144 QTalk.exe 93 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 3240 3968 spolsvt.exe 94 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 3968 wrote to memory of 2868 3968 spolsvt.exe 95 PID 4892 wrote to memory of 4708 4892 letsvpn-latest.exe 96 PID 4892 wrote to memory of 4708 4892 letsvpn-latest.exe 96 PID 4892 wrote to memory of 4708 4892 letsvpn-latest.exe 96 PID 4892 wrote to memory of 448 4892 letsvpn-latest.exe 97 PID 4892 wrote to memory of 448 4892 letsvpn-latest.exe 97 PID 4892 wrote to memory of 448 4892 letsvpn-latest.exe 97 PID 4708 wrote to memory of 1728 4708 letsvpn-latest.exe 98 PID 4708 wrote to memory of 1728 4708 letsvpn-latest.exe 98 PID 448 wrote to memory of 4836 448 letsvpn-latest.exe 100 PID 448 wrote to memory of 4836 448 letsvpn-latest.exe 100
Processes
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C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe"C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4892 -
C:\Windows\SYSTEM32\cmd.execmd.exe /c set2⤵PID:1896
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C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exePECMD**pecmd-cmd* PUTF -dd -skipb=960512 -len=15777341 "C:\Users\Admin\AppData\Local\Temp\~5177645199360135221.tmp",,C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1504
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C:\Users\Admin\AppData\Local\Temp\~2351677112895057980~\sg.tmp7zG_exe x "C:\Users\Admin\AppData\Local\Temp\~5177645199360135221.tmp" -y -aoa -o"C:\Program Files (x86)\Common Files\"2⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
PID:4100
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C:\Program Files (x86)\Common Files\ubc.exe"C:\Program Files (x86)\Common Files\\ubc.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Checks whether UAC is enabled
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3000 -
C:\Users\Public\Documents\sougou\V4.6.80\Bin\QTalk.exeC:\Users\Public\Documents\sougou\V4.6.80\Bin\QTalk.exe3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2144 -
C:\Users\Public\Documents\sougou\spolsvt.exeC:\Users\Public\Documents\sougou\spolsvt.exe4⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3968 -
C:\Users\Public\Documents\dd\spolsvt.exeC:\Users\Public\Documents\dd\spolsvt.exe5⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3240
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C:\Users\Public\Documents\uu\svcoth.exeC:\Users\Public\Documents\uu\svcoth.exe5⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2868
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C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exePECMD**pecmd-cmd* EXEC -wd:C: -hide cmd /c "C:\Users\Admin\AppData\Local\Temp\~8781390663049655329.cmd"2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4708 -
C:\Windows\SYSTEM32\cmd.execmd /c "C:\Users\Admin\AppData\Local\Temp\~8781390663049655329.cmd"3⤵PID:1728
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C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exePECMD**pecmd-cmd* EXEC -wd:C: -hide cmd /c "C:\Users\Admin\AppData\Local\Temp\~6908697070151061552.cmd"2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:448 -
C:\Windows\SYSTEM32\cmd.execmd /c "C:\Users\Admin\AppData\Local\Temp\~6908697070151061552.cmd"3⤵PID:4836
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
14.5MB
MD59c44be4ceac0c983a812fd8459511fd0
SHA1bd5aaad4acd523cd2855e8b50a8380365d81e041
SHA256b6750a3631413d71d7ea10292a11e5d0560afb6ccd4ad4baa75d7dc80842f153
SHA512372ddeb1045d49e8f98f17bccffb0e3edc2179e541f8a4493300517327e514c7bf64557250e0f84f7366310a3d7a58a8d5480596f9be075b3f5d9411a49b4d09
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Filesize
761KB
MD580c469aef3c93b7062ee21d4dbd1f43f
SHA1df5ddf2d4257e89941c57e4d935da424dfd839a7
SHA2562ca06c6d19785bd5b9e8f05da99311fcaafd64384df164c1f06a33622aaa397b
SHA512e868d2a4d54ee4e16e8fce35447029eb0317dd8da961cf6b44ac13504b1b9fa8046faaaca9d432cd132ef928c247de7a588d9f30fabb3fd8a61a2ee5475006d4
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Filesize
715KB
MD57c4718943bd3f66ebdb47ccca72c7b1e
SHA1f9edfaa7adb8fa528b2e61b2b251f18da10a6969
SHA2564cc32d00338fc7b206a7c052297acf9ac304ae7de9d61a2475a116959c1524fc
SHA512e18c40d646fa4948f90f7471da55489df431f255041ebb6dcef86346f91078c9b27894e27216a4b2fe2a1c5e501c7953c77893cf696930123d28a322d49e1516
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Filesize
15.0MB
MD54bff5e3d2cee40de0b1f0d6ee79297c1
SHA184d75479fb973f427560383f9b7831800632d2cf
SHA25645535bc6c6ee9a45d63d5dcd826b4f87f78ab4f7421757dafa7bb36010473991
SHA512649d4aff33cfabec7380c8ee2a2b0725470527ec29dcf2a5818a60476dbbef03dc58fbade03437ccd16efdbd6bb2e91cf8ff3b25d134a0c5e71f03627b671263
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Filesize
371B
MD54d9a1f423d5af5ab826fbe31a6e3ff96
SHA1071ff69d5aed3502cad231c3bb61b41f80b11c1e
SHA256eb9fddc125fcbadd7371e5b4668a92d0dd08739ba1437bebb693aa9fd62ff1b8
SHA51265ac62c4cd32f2228db180f7b67c9d7299dd7fee5ec55e4e8ac9c500bb4c1f3364e6fcc420a2c9d10201e9bd6f88144e0f5287251e3acc96528a396927bba860
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Filesize
319B
MD56fa45475403d315e37c76a45f4b8b50c
SHA145ceb42fb50cac58ea9123b9ac075ace33c41afd
SHA2568ed7f3eef624d4eff5dc080c319d4feb6277c2ec06445e1cbc9129ad20654cd4
SHA512c431253bae03309d3c033b1fb1b0e0093df28a79f028fe77c034b356684e0769c7db0c554dbffd79b4eabd82bbfbd13a059291386b1a39746e42fbfe4ccb4d99
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Filesize
121B
MD514240e0482c263f2485828562ac44205
SHA1738a8685f89d6b829315003b96f6818927e6f7bb
SHA2567d125b43b4179fe5a31073680c51fb71b942ddbdbc9cb310867c16863705aa6e
SHA512d1f3b4919ce95fa2ca9b139e53e5f5896ddc2a2bd208e37e373ae8d955a8bc15de6682b86e2e19cb824823bcbabb66ed426c2cd1e05fc700fe19ded92fa882ee
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Filesize
16KB
MD5cdce4713e784ae069d73723034a957ff
SHA19a393a6bab6568f1a774fb753353223f11367e09
SHA256b29e48102ecb3d3614e8980a8b8cc63dd2b993c6346f466479244ec2b47b69d8
SHA5120a3a59a305cc2a6fad4e1315b0bcc5a4129595dfe1e8b703363fa02528d2d7c48d3fd22d365708be84a5557cf1916873df9563c454732f93f94a66e7e3b9fb0f
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Filesize
196KB
MD5fc51b596793d77c284e29c7b1371c1e9
SHA1af3bec0adbcb9ec9b10ed7c4f826fc5137d6db3f
SHA256157507c0e3aaababdb6087104a9841995c1cd5b06991bccf192cba68cbfb2281
SHA512e160812d3d8d33d2ca4df4177073e7a8dedfad443f49cd87316d049b1a9efcfe5de14d8aabb7c900a6b484181fe34a71f4ca70c31f7fcaf76679b649fffaa73d
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Filesize
9KB
MD5523d5c39f9d8d2375c3df68251fa2249
SHA1d4ed365c44bec9246fc1a65a32a7791792647a10
SHA25620e3dc90a3e83b6202e2a7f4603b60e5e859639cb68693426c400b13aaeabd78
SHA512526e1bba30d03f1ac177c6ab7409187a730969c429cebef15da68ffcf44b3b93227781eebc827b2f7a0fa17c391e00a0e532263fd0167aeaeb0456f96cfe3ae4