Analysis
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max time kernel
9s -
max time network
45s -
platform
windows7_x64 -
resource
win7v20210410 -
submitted
26-07-2021 13:51
Static task
static1
Behavioral task
behavioral1
Sample
183-60005400R revA.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
183-60005400R revA.exe
Resource
win10v20210410
General
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Target
183-60005400R revA.exe
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Size
447KB
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MD5
458ad2463c8a61f37ce0c256d5d824e0
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SHA1
3d9e3331f558962d5fbbab68f8a9dcca0b31bb6f
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SHA256
b1b4adb57471b463700ab48f81cd2550270fac73e0c1a95366fdc4380d15a659
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SHA512
690cc999cf47d7d4020c3087c261b67a1468ed38392cf7b63ff41ed18a93d1a36a2f685c6f44c4121e61a2f49430ac019b7aff45a3a4a8a8da89339ce40b3a17
Malware Config
Extracted
oski
evakark.xyz
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 5 IoCs
Processes:
183-60005400R revA.exepid process 1060 183-60005400R revA.exe 1060 183-60005400R revA.exe 1060 183-60005400R revA.exe 1060 183-60005400R revA.exe 1060 183-60005400R revA.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:
183-60005400R revA.exedescription pid process target process PID 1644 set thread context of 1060 1644 183-60005400R revA.exe 183-60005400R revA.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:
183-60005400R revA.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString 183-60005400R revA.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1768 taskkill.exe -
Suspicious behavior: MapViewOfSection 1 IoCs
Processes:
183-60005400R revA.exepid process 1644 183-60005400R revA.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 1768 taskkill.exe -
Suspicious use of WriteProcessMemory 13 IoCs
Processes:
183-60005400R revA.exe183-60005400R revA.execmd.exedescription pid process target process PID 1644 wrote to memory of 1060 1644 183-60005400R revA.exe 183-60005400R revA.exe PID 1644 wrote to memory of 1060 1644 183-60005400R revA.exe 183-60005400R revA.exe PID 1644 wrote to memory of 1060 1644 183-60005400R revA.exe 183-60005400R revA.exe PID 1644 wrote to memory of 1060 1644 183-60005400R revA.exe 183-60005400R revA.exe PID 1644 wrote to memory of 1060 1644 183-60005400R revA.exe 183-60005400R revA.exe PID 1060 wrote to memory of 776 1060 183-60005400R revA.exe cmd.exe PID 1060 wrote to memory of 776 1060 183-60005400R revA.exe cmd.exe PID 1060 wrote to memory of 776 1060 183-60005400R revA.exe cmd.exe PID 1060 wrote to memory of 776 1060 183-60005400R revA.exe cmd.exe PID 776 wrote to memory of 1768 776 cmd.exe taskkill.exe PID 776 wrote to memory of 1768 776 cmd.exe taskkill.exe PID 776 wrote to memory of 1768 776 cmd.exe taskkill.exe PID 776 wrote to memory of 1768 776 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\183-60005400R revA.exe"C:\Users\Admin\AppData\Local\Temp\183-60005400R revA.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\183-60005400R revA.exe"C:\Users\Admin\AppData\Local\Temp\183-60005400R revA.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 1060 & erase C:\Users\Admin\AppData\Local\Temp\183-60005400R revA.exe & RD /S /Q C:\\ProgramData\\483996907604505\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 10604⤵
- 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/776-70-0x0000000000000000-mapping.dmp
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memory/1060-61-0x000000000040717B-mapping.dmp
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memory/1060-64-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1644-60-0x00000000752F1000-0x00000000752F3000-memory.dmpFilesize
8KB
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memory/1644-63-0x0000000000220000-0x0000000000222000-memory.dmpFilesize
8KB
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memory/1768-71-0x0000000000000000-mapping.dmp