Analysis
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max time kernel
148s -
max time network
149s -
platform
windows10_x64 -
resource
win10v20210410 -
submitted
29-04-2021 06:29
Static task
static1
Behavioral task
behavioral1
Sample
ef8bf0e0c08418ed74b33120185fd044.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
ef8bf0e0c08418ed74b33120185fd044.exe
Resource
win10v20210410
General
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Target
ef8bf0e0c08418ed74b33120185fd044.exe
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Size
219KB
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MD5
ef8bf0e0c08418ed74b33120185fd044
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SHA1
4c0654f0475f0e001cfbf9bf47caed94ae137af8
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SHA256
d8b500427918db815fb5b55eb807c8830192ea1ccd676d4a17155f4d10a1c36e
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SHA512
b343f4de6369004adb8a5d042ed272fc8b6680c5013fe6dba98161cfe32c3a518a3c055eb46973d7768874462aa506414e236997e6984706e193e4a7999016ab
Malware Config
Extracted
oski
205.185.120.57
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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Loads dropped DLL 3 IoCs
Processes:
ef8bf0e0c08418ed74b33120185fd044.exepid process 3456 ef8bf0e0c08418ed74b33120185fd044.exe 3456 ef8bf0e0c08418ed74b33120185fd044.exe 3456 ef8bf0e0c08418ed74b33120185fd044.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:
ef8bf0e0c08418ed74b33120185fd044.exedescription pid process target process PID 3212 set thread context of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.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:
ef8bf0e0c08418ed74b33120185fd044.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString ef8bf0e0c08418ed74b33120185fd044.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1380 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 10 IoCs
Processes:
ef8bf0e0c08418ed74b33120185fd044.exepid process 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe 3212 ef8bf0e0c08418ed74b33120185fd044.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
ef8bf0e0c08418ed74b33120185fd044.exetaskkill.exedescription pid process Token: SeDebugPrivilege 3212 ef8bf0e0c08418ed74b33120185fd044.exe Token: SeDebugPrivilege 1380 taskkill.exe -
Suspicious use of WriteProcessMemory 21 IoCs
Processes:
ef8bf0e0c08418ed74b33120185fd044.exeef8bf0e0c08418ed74b33120185fd044.execmd.exedescription pid process target process PID 3212 wrote to memory of 3396 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3396 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3396 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3488 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3488 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3488 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3212 wrote to memory of 3456 3212 ef8bf0e0c08418ed74b33120185fd044.exe ef8bf0e0c08418ed74b33120185fd044.exe PID 3456 wrote to memory of 3732 3456 ef8bf0e0c08418ed74b33120185fd044.exe cmd.exe PID 3456 wrote to memory of 3732 3456 ef8bf0e0c08418ed74b33120185fd044.exe cmd.exe PID 3456 wrote to memory of 3732 3456 ef8bf0e0c08418ed74b33120185fd044.exe cmd.exe PID 3732 wrote to memory of 1380 3732 cmd.exe taskkill.exe PID 3732 wrote to memory of 1380 3732 cmd.exe taskkill.exe PID 3732 wrote to memory of 1380 3732 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.exe"C:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.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\ef8bf0e0c08418ed74b33120185fd044.exeC:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.exe2⤵
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C:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.exeC:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.exe2⤵
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C:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.exeC:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.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 3456 & erase C:\Users\Admin\AppData\Local\Temp\ef8bf0e0c08418ed74b33120185fd044.exe & RD /S /Q C:\\ProgramData\\220398869702575\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 34564⤵
- 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\nss3.dllMD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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\ProgramData\sqlite3.dllMD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c
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memory/1380-129-0x0000000000000000-mapping.dmp
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memory/3212-121-0x0000000005060000-0x000000000507E000-memory.dmpFilesize
120KB
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memory/3212-120-0x0000000005010000-0x0000000005011000-memory.dmpFilesize
4KB
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memory/3212-114-0x0000000000760000-0x0000000000761000-memory.dmpFilesize
4KB
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memory/3212-119-0x0000000005000000-0x0000000005001000-memory.dmpFilesize
4KB
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memory/3212-118-0x0000000005090000-0x0000000005091000-memory.dmpFilesize
4KB
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memory/3212-117-0x00000000029F0000-0x00000000029F2000-memory.dmpFilesize
8KB
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memory/3212-116-0x0000000005510000-0x0000000005511000-memory.dmpFilesize
4KB
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memory/3456-123-0x000000000040717B-mapping.dmp
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memory/3456-122-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/3456-124-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/3732-128-0x0000000000000000-mapping.dmp