Analysis
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max time kernel
123s -
max time network
125s -
platform
windows7_x64 -
resource
win7v20210410 -
submitted
06-05-2021 10:56
Static task
static1
Behavioral task
behavioral1
Sample
PO5621.scr.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
PO5621.scr.exe
Resource
win10v20210408
General
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Target
PO5621.scr.exe
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Size
307KB
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MD5
769971b221bd083f1f14c70b6a04a1fc
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SHA1
2302767a678cd7f7c68081028fdc69dc9eea9fd3
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SHA256
a68ec0c26f99b4f59d0abbd7cc98de6d9136ffe0d822d8056476d356121e5011
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SHA512
b1f472f4990b2b3958118c4839cb6f2dfe21be84786c89ffe18efbb456f821de7b2943033d85b9df17d8ad0d4fe1c42dafc96df868fda99e2f2731b24b1572b3
Malware Config
Extracted
oski
203.159.80.65
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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Deletes itself 1 IoCs
Processes:
cmd.exepid process 568 cmd.exe -
Loads dropped DLL 6 IoCs
Processes:
PO5621.scr.exePO5621.scr.exepid process 1088 PO5621.scr.exe 1968 PO5621.scr.exe 1968 PO5621.scr.exe 1968 PO5621.scr.exe 1968 PO5621.scr.exe 1968 PO5621.scr.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:
PO5621.scr.exedescription pid process target process PID 1088 set thread context of 1968 1088 PO5621.scr.exe PO5621.scr.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:
PO5621.scr.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString PO5621.scr.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1688 taskkill.exe -
Suspicious behavior: MapViewOfSection 1 IoCs
Processes:
PO5621.scr.exepid process 1088 PO5621.scr.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 1688 taskkill.exe -
Suspicious use of WriteProcessMemory 13 IoCs
Processes:
PO5621.scr.exePO5621.scr.execmd.exedescription pid process target process PID 1088 wrote to memory of 1968 1088 PO5621.scr.exe PO5621.scr.exe PID 1088 wrote to memory of 1968 1088 PO5621.scr.exe PO5621.scr.exe PID 1088 wrote to memory of 1968 1088 PO5621.scr.exe PO5621.scr.exe PID 1088 wrote to memory of 1968 1088 PO5621.scr.exe PO5621.scr.exe PID 1088 wrote to memory of 1968 1088 PO5621.scr.exe PO5621.scr.exe PID 1968 wrote to memory of 568 1968 PO5621.scr.exe cmd.exe PID 1968 wrote to memory of 568 1968 PO5621.scr.exe cmd.exe PID 1968 wrote to memory of 568 1968 PO5621.scr.exe cmd.exe PID 1968 wrote to memory of 568 1968 PO5621.scr.exe cmd.exe PID 568 wrote to memory of 1688 568 cmd.exe taskkill.exe PID 568 wrote to memory of 1688 568 cmd.exe taskkill.exe PID 568 wrote to memory of 1688 568 cmd.exe taskkill.exe PID 568 wrote to memory of 1688 568 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe"C:\Users\Admin\AppData\Local\Temp\PO5621.scr.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 1968 & erase C:\Users\Admin\AppData\Local\Temp\PO5621.scr.exe & RD /S /Q C:\\ProgramData\\503017335686340\\* & exit3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 19684⤵
- 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\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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\Users\Admin\AppData\Local\Temp\nsc32F3.tmp\x3800u72sulnc.dllMD5
a5e89c52761a668b8e813cea684ebd1a
SHA1620d2c8f26e4b8e5aeb4fb8c006380819d5eb457
SHA2565b484be3e0bd3a294bea5600887824e3656531bb819941986017bd12670012b8
SHA5122b5d695307e695580d442ceea279a6435b6bb415b2d0ca2ec917267ddf509006201191ec30972ffb25978e173de48c8168d7e12b91034470dbe241accd5adc34
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memory/568-70-0x0000000000000000-mapping.dmp
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memory/1088-59-0x00000000753B1000-0x00000000753B3000-memory.dmpFilesize
8KB
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memory/1088-61-0x00000000002F0000-0x00000000002F2000-memory.dmpFilesize
8KB
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memory/1688-71-0x0000000000000000-mapping.dmp
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memory/1968-62-0x000000000040717B-mapping.dmp
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memory/1968-64-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB