Analysis
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max time kernel
13s -
max time network
114s -
platform
windows10_x64 -
resource
win10v20210410 -
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 3 IoCs
Processes:
183-60005400R revA.exepid process 1432 183-60005400R revA.exe 1432 183-60005400R revA.exe 1432 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 3808 set thread context of 1432 3808 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 3520 taskkill.exe -
Suspicious behavior: MapViewOfSection 1 IoCs
Processes:
183-60005400R revA.exepid process 3808 183-60005400R revA.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 3520 taskkill.exe -
Suspicious use of WriteProcessMemory 10 IoCs
Processes:
183-60005400R revA.exe183-60005400R revA.execmd.exedescription pid process target process PID 3808 wrote to memory of 1432 3808 183-60005400R revA.exe 183-60005400R revA.exe PID 3808 wrote to memory of 1432 3808 183-60005400R revA.exe 183-60005400R revA.exe PID 3808 wrote to memory of 1432 3808 183-60005400R revA.exe 183-60005400R revA.exe PID 3808 wrote to memory of 1432 3808 183-60005400R revA.exe 183-60005400R revA.exe PID 1432 wrote to memory of 776 1432 183-60005400R revA.exe cmd.exe PID 1432 wrote to memory of 776 1432 183-60005400R revA.exe cmd.exe PID 1432 wrote to memory of 776 1432 183-60005400R revA.exe cmd.exe PID 776 wrote to memory of 3520 776 cmd.exe taskkill.exe PID 776 wrote to memory of 3520 776 cmd.exe taskkill.exe PID 776 wrote to memory of 3520 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
PID:3808 -
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
PID:1432 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 1432 & erase C:\Users\Admin\AppData\Local\Temp\183-60005400R revA.exe & RD /S /Q C:\\ProgramData\\612235946930661\\* & exit3⤵
- Suspicious use of WriteProcessMemory
PID:776 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 14324⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:3520
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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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/776-120-0x0000000000000000-mapping.dmp
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memory/1432-114-0x000000000040717B-mapping.dmp
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memory/1432-116-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/3520-121-0x0000000000000000-mapping.dmp
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memory/3808-115-0x0000000000560000-0x00000000006AA000-memory.dmpFilesize
1.3MB