Analysis
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max time kernel
127s -
max time network
126s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
07-05-2021 11:03
Static task
static1
Behavioral task
behavioral1
Sample
Purchase Order 07052021.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
Purchase Order 07052021.exe
Resource
win10v20210408
General
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Target
Purchase Order 07052021.exe
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Size
819KB
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MD5
bdddbdfd52d8740ae768c48788804531
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SHA1
d2d1452cd22f11e136c6d96467f893aee0477398
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SHA256
138ccd9e494958214619110418407a634db9d8b073be4ffcd7d23083b58fb945
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SHA512
9e9c7f5563dbe473b165e95b4205c98962eb4854cad934296e5e37b9d2e642564a390334a98c86ec650f983938d762887a3184a6159af42aeab6a6bd375a7c29
Malware Config
Extracted
oski
209.141.49.199
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:
Purchase Order 07052021.exepid process 1332 Purchase Order 07052021.exe 1332 Purchase Order 07052021.exe 1332 Purchase Order 07052021.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:
Purchase Order 07052021.exedescription pid process target process PID 908 set thread context of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.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:
Purchase Order 07052021.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString Purchase Order 07052021.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 4080 taskkill.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 4080 taskkill.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
Purchase Order 07052021.exePurchase Order 07052021.execmd.exedescription pid process target process PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 908 wrote to memory of 1332 908 Purchase Order 07052021.exe Purchase Order 07052021.exe PID 1332 wrote to memory of 1152 1332 Purchase Order 07052021.exe cmd.exe PID 1332 wrote to memory of 1152 1332 Purchase Order 07052021.exe cmd.exe PID 1332 wrote to memory of 1152 1332 Purchase Order 07052021.exe cmd.exe PID 1152 wrote to memory of 4080 1152 cmd.exe taskkill.exe PID 1152 wrote to memory of 4080 1152 cmd.exe taskkill.exe PID 1152 wrote to memory of 4080 1152 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Purchase Order 07052021.exe"C:\Users\Admin\AppData\Local\Temp\Purchase Order 07052021.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\Purchase Order 07052021.exe"C:\Users\Admin\AppData\Local\Temp\Purchase Order 07052021.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 1332 & erase C:\Users\Admin\AppData\Local\Temp\Purchase Order 07052021.exe & RD /S /Q C:\\ProgramData\\389750375203950\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 13324⤵
- 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/908-119-0x0000000005100000-0x0000000005192000-memory.dmpFilesize
584KB
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memory/908-117-0x00000000051A0000-0x00000000051A1000-memory.dmpFilesize
4KB
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memory/908-120-0x0000000005250000-0x0000000005251000-memory.dmpFilesize
4KB
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memory/908-121-0x00000000055A0000-0x00000000055AE000-memory.dmpFilesize
56KB
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memory/908-122-0x0000000001000000-0x000000000109E000-memory.dmpFilesize
632KB
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memory/908-123-0x00000000011A0000-0x00000000011FF000-memory.dmpFilesize
380KB
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memory/908-116-0x00000000057D0000-0x00000000057D1000-memory.dmpFilesize
4KB
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memory/908-114-0x0000000000770000-0x0000000000771000-memory.dmpFilesize
4KB
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memory/908-118-0x0000000005370000-0x0000000005371000-memory.dmpFilesize
4KB
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memory/1152-130-0x0000000000000000-mapping.dmp
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memory/1332-126-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1332-125-0x000000000040717B-mapping.dmp
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memory/1332-124-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/4080-131-0x0000000000000000-mapping.dmp