Analysis
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max time kernel
107s -
max time network
113s -
platform
windows10_x64 -
resource
win10v20210410 -
submitted
03-05-2021 14:02
Static task
static1
Behavioral task
behavioral1
Sample
IMG602741105.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
IMG602741105.exe
Resource
win10v20210410
General
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Target
IMG602741105.exe
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Size
225KB
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MD5
0e444899ae75dd87e33621fd953ed450
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SHA1
3c1ec410dcdb4992e58c20a215354fb3714b2b28
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SHA256
5e90997364ac5c40a3c374faa4a11c74e9d040e42c10a2dcab169818e1d717b5
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SHA512
01e0af5122b9aa2fc58ad552ab91eb1b6dc6fc7ece3338faa2e4fc41835742bc8387ab93f6f8d810cc73405e11cfeea59b6aa323fcdcb80b979a4911673905eb
Malware Config
Extracted
oski
198.98.49.140
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:
IMG602741105.exepid process 3976 IMG602741105.exe 3976 IMG602741105.exe 3976 IMG602741105.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:
IMG602741105.exedescription pid process target process PID 4440 set thread context of 3976 4440 IMG602741105.exe IMG602741105.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:
IMG602741105.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString IMG602741105.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 4224 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
IMG602741105.exepid process 4440 IMG602741105.exe 4440 IMG602741105.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
IMG602741105.exetaskkill.exedescription pid process Token: SeDebugPrivilege 4440 IMG602741105.exe Token: SeDebugPrivilege 4224 taskkill.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
IMG602741105.exeIMG602741105.execmd.exedescription pid process target process PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 4440 wrote to memory of 3976 4440 IMG602741105.exe IMG602741105.exe PID 3976 wrote to memory of 4264 3976 IMG602741105.exe cmd.exe PID 3976 wrote to memory of 4264 3976 IMG602741105.exe cmd.exe PID 3976 wrote to memory of 4264 3976 IMG602741105.exe cmd.exe PID 4264 wrote to memory of 4224 4264 cmd.exe taskkill.exe PID 4264 wrote to memory of 4224 4264 cmd.exe taskkill.exe PID 4264 wrote to memory of 4224 4264 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\IMG602741105.exe"C:\Users\Admin\AppData\Local\Temp\IMG602741105.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\IMG602741105.exeC:\Users\Admin\AppData\Local\Temp\IMG602741105.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 3976 & erase C:\Users\Admin\AppData\Local\Temp\IMG602741105.exe & RD /S /Q C:\\ProgramData\\723041047338373\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 39764⤵
- 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\nss3.dllMD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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\ProgramData\sqlite3.dllMD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c
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memory/3976-122-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/3976-124-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/3976-123-0x000000000040717B-mapping.dmp
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memory/4224-129-0x0000000000000000-mapping.dmp
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memory/4264-128-0x0000000000000000-mapping.dmp
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memory/4440-118-0x00000000051B0000-0x00000000051B1000-memory.dmpFilesize
4KB
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memory/4440-121-0x0000000005D00000-0x0000000005D1C000-memory.dmpFilesize
112KB
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memory/4440-120-0x0000000005B80000-0x0000000005B81000-memory.dmpFilesize
4KB
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memory/4440-119-0x0000000004CB0000-0x0000000004CB1000-memory.dmpFilesize
4KB
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memory/4440-114-0x0000000000350000-0x0000000000351000-memory.dmpFilesize
4KB
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memory/4440-117-0x0000000002670000-0x0000000002672000-memory.dmpFilesize
8KB
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memory/4440-116-0x0000000004CA0000-0x0000000004CA1000-memory.dmpFilesize
4KB