Analysis
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max time kernel
68s -
max time network
67s -
platform
windows7_x64 -
resource
win7v20210408 -
submitted
07-05-2021 06:00
Static task
static1
Behavioral task
behavioral1
Sample
IMG053110579.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
IMG053110579.exe
Resource
win10v20210410
General
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Target
IMG053110579.exe
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Size
263KB
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MD5
8ff3cd20c7ca5a373dc7b988e2668bb5
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SHA1
a278ea762a0ade0c58ad49e9aa15075ef61e592c
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SHA256
5f55898f4f260025ec6507f92ed128dcd90f5f83d14b507282352f4c79fb71bc
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SHA512
38e230b2a08e4ba51f64d8d3d05adf0b4546ef7675932309983b8162653585312f92202d8ca0d3901585756061d3fdf27aa8b3355bd3f5ca6727148e81051b56
Malware Config
Extracted
oski
209.141.40.19
Signatures
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Oski
Oski is an infostealer targeting browser data, crypto wallets.
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Downloads MZ/PE file
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Deletes itself 1 IoCs
Processes:
cmd.exepid process 756 cmd.exe -
Loads dropped DLL 5 IoCs
Processes:
IMG053110579.exepid process 1248 IMG053110579.exe 1248 IMG053110579.exe 1248 IMG053110579.exe 1248 IMG053110579.exe 1248 IMG053110579.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:
IMG053110579.exedescription pid process target process PID 108 set thread context of 1248 108 IMG053110579.exe IMG053110579.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:
IMG053110579.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString IMG053110579.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 928 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
IMG053110579.exepid process 108 IMG053110579.exe 108 IMG053110579.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
IMG053110579.exetaskkill.exedescription pid process Token: SeDebugPrivilege 108 IMG053110579.exe Token: SeDebugPrivilege 928 taskkill.exe -
Suspicious use of WriteProcessMemory 18 IoCs
Processes:
IMG053110579.exeIMG053110579.execmd.exedescription pid process target process PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 108 wrote to memory of 1248 108 IMG053110579.exe IMG053110579.exe PID 1248 wrote to memory of 756 1248 IMG053110579.exe cmd.exe PID 1248 wrote to memory of 756 1248 IMG053110579.exe cmd.exe PID 1248 wrote to memory of 756 1248 IMG053110579.exe cmd.exe PID 1248 wrote to memory of 756 1248 IMG053110579.exe cmd.exe PID 756 wrote to memory of 928 756 cmd.exe taskkill.exe PID 756 wrote to memory of 928 756 cmd.exe taskkill.exe PID 756 wrote to memory of 928 756 cmd.exe taskkill.exe PID 756 wrote to memory of 928 756 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\IMG053110579.exe"C:\Users\Admin\AppData\Local\Temp\IMG053110579.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\IMG053110579.exeC:\Users\Admin\AppData\Local\Temp\IMG053110579.exe2⤵
- 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 1248 & erase C:\Users\Admin\AppData\Local\Temp\IMG053110579.exe & RD /S /Q C:\\ProgramData\\451250043872688\\* & exit3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 12484⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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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/108-64-0x0000000000670000-0x00000000006A2000-memory.dmpFilesize
200KB
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memory/108-60-0x0000000000E40000-0x0000000000E41000-memory.dmpFilesize
4KB
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memory/108-63-0x0000000000360000-0x000000000036C000-memory.dmpFilesize
48KB
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memory/108-62-0x0000000004AB0000-0x0000000004AB1000-memory.dmpFilesize
4KB
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memory/756-74-0x0000000000000000-mapping.dmp
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memory/928-75-0x0000000000000000-mapping.dmp
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memory/1248-67-0x0000000075AF1000-0x0000000075AF3000-memory.dmpFilesize
8KB
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memory/1248-68-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1248-66-0x000000000040717B-mapping.dmp
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memory/1248-65-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB