Analysis
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max time kernel
117s -
max time network
117s -
platform
windows7_x64 -
resource
win7-en-20211014 -
submitted
30-11-2021 14:45
Static task
static1
Behavioral task
behavioral1
Sample
CTYH 53069184.exe
Resource
win7-en-20211014
General
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Target
CTYH 53069184.exe
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Size
622KB
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MD5
8f3fb2446099de27ca50c13ad0d80245
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SHA1
04bf820780ced24814bf9a8ac4628f336a8cf596
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SHA256
b1fb8aca24889f4446865d60a21b47b5214cebff2ee9f797ae49b7b3885b2cff
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SHA512
79933bc3a0382f2417904955f1d4332f456a1ba72a30cddd406585096cdfd03dd6e545861bb4a1f6b5e9803588810e41f4b162d9378489b9bfedf4f3c7b1fe49
Malware Config
Extracted
oski
tecnomedica.com.py
Signatures
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Oski
Oski is an infostealer targeting browser data, crypto wallets.
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suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
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suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
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Downloads MZ/PE file
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Loads dropped DLL 5 IoCs
Processes:
CTYH 53069184.exepid process 832 CTYH 53069184.exe 832 CTYH 53069184.exe 832 CTYH 53069184.exe 832 CTYH 53069184.exe 832 CTYH 53069184.exe -
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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Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
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Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Suspicious use of SetThreadContext 1 IoCs
Processes:
CTYH 53069184.exedescription pid process target process PID 2024 set thread context of 832 2024 CTYH 53069184.exe CTYH 53069184.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
CTYH 53069184.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString CTYH 53069184.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 956 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
CTYH 53069184.exepowershell.exepid process 2024 CTYH 53069184.exe 1032 powershell.exe -
Suspicious use of AdjustPrivilegeToken 3 IoCs
Processes:
CTYH 53069184.exepowershell.exetaskkill.exedescription pid process Token: SeDebugPrivilege 2024 CTYH 53069184.exe Token: SeDebugPrivilege 1032 powershell.exe Token: SeDebugPrivilege 956 taskkill.exe -
Suspicious use of WriteProcessMemory 26 IoCs
Processes:
CTYH 53069184.exeCTYH 53069184.execmd.exedescription pid process target process PID 2024 wrote to memory of 1032 2024 CTYH 53069184.exe powershell.exe PID 2024 wrote to memory of 1032 2024 CTYH 53069184.exe powershell.exe PID 2024 wrote to memory of 1032 2024 CTYH 53069184.exe powershell.exe PID 2024 wrote to memory of 1032 2024 CTYH 53069184.exe powershell.exe PID 2024 wrote to memory of 1268 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 1268 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 1268 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 1268 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 2024 wrote to memory of 832 2024 CTYH 53069184.exe CTYH 53069184.exe PID 832 wrote to memory of 916 832 CTYH 53069184.exe cmd.exe PID 832 wrote to memory of 916 832 CTYH 53069184.exe cmd.exe PID 832 wrote to memory of 916 832 CTYH 53069184.exe cmd.exe PID 832 wrote to memory of 916 832 CTYH 53069184.exe cmd.exe PID 916 wrote to memory of 956 916 cmd.exe taskkill.exe PID 916 wrote to memory of 956 916 cmd.exe taskkill.exe PID 916 wrote to memory of 956 916 cmd.exe taskkill.exe PID 916 wrote to memory of 956 916 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"2⤵
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C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe"2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 832 & erase C:\Users\Admin\AppData\Local\Temp\CTYH 53069184.exe & RD /S /Q C:\\ProgramData\\632461796674937\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 8324⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
Loading Replay Monitor...
Downloads
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\ProgramData\mozglue.dllMD5
8f73c08a9660691143661bf7332c3c27
SHA137fa65dd737c50fda710fdbde89e51374d0c204a
SHA2563fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA5120042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89
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\ProgramData\msvcp140.dllMD5
109f0f02fd37c84bfc7508d4227d7ed5
SHA1ef7420141bb15ac334d3964082361a460bfdb975
SHA256334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4
SHA51246eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39
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\ProgramData\nss3.dllMD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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\ProgramData\sqlite3.dllMD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c
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\ProgramData\vcruntime140.dllMD5
7587bf9cb4147022cd5681b015183046
SHA1f2106306a8f6f0da5afb7fc765cfa0757ad5a628
SHA256c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d
SHA5120b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f
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memory/832-63-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/832-64-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/832-65-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/832-67-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/832-66-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/832-68-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/832-69-0x000000000040717B-mapping.dmp
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memory/832-71-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/916-80-0x0000000000000000-mapping.dmp
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memory/956-81-0x0000000000000000-mapping.dmp
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memory/1032-72-0x00000000023C0000-0x000000000300A000-memory.dmpFilesize
12.3MB
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memory/1032-74-0x00000000023C0000-0x000000000300A000-memory.dmpFilesize
12.3MB
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memory/1032-61-0x0000000000000000-mapping.dmp
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memory/1032-73-0x00000000023C0000-0x000000000300A000-memory.dmpFilesize
12.3MB
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memory/2024-60-0x0000000005020000-0x0000000005085000-memory.dmpFilesize
404KB
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memory/2024-59-0x0000000000450000-0x0000000000456000-memory.dmpFilesize
24KB
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memory/2024-58-0x0000000004D50000-0x0000000004D51000-memory.dmpFilesize
4KB
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memory/2024-57-0x0000000075D41000-0x0000000075D43000-memory.dmpFilesize
8KB
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memory/2024-55-0x0000000000830000-0x0000000000831000-memory.dmpFilesize
4KB