Analysis
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max time kernel
6s -
max time network
92s -
platform
windows7_x64 -
resource
win7v20210410 -
submitted
28-07-2021 00:29
Static task
static1
Behavioral task
behavioral1
Sample
RFQ-096857654.exe
Resource
win7v20210410
General
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Target
RFQ-096857654.exe
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Size
313KB
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MD5
5ad9f6be601fb9f23677c239c91deae2
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SHA1
a0162b62231692e94ca41aac27cec6063179a9da
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SHA256
90a9ef1c549a9f2646f6c603e27570832f371d25d2fc4b967c96f55fa034e557
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SHA512
60d3f39a18811ac40c3b5d14e34eaac8334627545c703006f25e297b5f2fe3669715ea7e92a44f05991a0567a14a79c6f8a239651f85738ec30f61ae790a8737
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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suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
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suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
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Downloads MZ/PE file
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Deletes itself 1 IoCs
Processes:
cmd.exepid process 1660 cmd.exe -
Loads dropped DLL 5 IoCs
Processes:
RFQ-096857654.exepid process 2036 RFQ-096857654.exe 2036 RFQ-096857654.exe 2036 RFQ-096857654.exe 2036 RFQ-096857654.exe 2036 RFQ-096857654.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:
RFQ-096857654.exedescription pid process target process PID 1080 set thread context of 2036 1080 RFQ-096857654.exe RFQ-096857654.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:
RFQ-096857654.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString RFQ-096857654.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 760 taskkill.exe -
Suspicious behavior: MapViewOfSection 1 IoCs
Processes:
RFQ-096857654.exepid process 1080 RFQ-096857654.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 760 taskkill.exe -
Suspicious use of WriteProcessMemory 13 IoCs
Processes:
RFQ-096857654.exeRFQ-096857654.execmd.exedescription pid process target process PID 1080 wrote to memory of 2036 1080 RFQ-096857654.exe RFQ-096857654.exe PID 1080 wrote to memory of 2036 1080 RFQ-096857654.exe RFQ-096857654.exe PID 1080 wrote to memory of 2036 1080 RFQ-096857654.exe RFQ-096857654.exe PID 1080 wrote to memory of 2036 1080 RFQ-096857654.exe RFQ-096857654.exe PID 1080 wrote to memory of 2036 1080 RFQ-096857654.exe RFQ-096857654.exe PID 2036 wrote to memory of 1660 2036 RFQ-096857654.exe cmd.exe PID 2036 wrote to memory of 1660 2036 RFQ-096857654.exe cmd.exe PID 2036 wrote to memory of 1660 2036 RFQ-096857654.exe cmd.exe PID 2036 wrote to memory of 1660 2036 RFQ-096857654.exe cmd.exe PID 1660 wrote to memory of 760 1660 cmd.exe taskkill.exe PID 1660 wrote to memory of 760 1660 cmd.exe taskkill.exe PID 1660 wrote to memory of 760 1660 cmd.exe taskkill.exe PID 1660 wrote to memory of 760 1660 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\RFQ-096857654.exe"C:\Users\Admin\AppData\Local\Temp\RFQ-096857654.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\RFQ-096857654.exe"C:\Users\Admin\AppData\Local\Temp\RFQ-096857654.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 2036 & erase C:\Users\Admin\AppData\Local\Temp\RFQ-096857654.exe & RD /S /Q C:\\ProgramData\\162617645963650\\* & exit3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 20364⤵
- 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/760-71-0x0000000000000000-mapping.dmp
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memory/1080-60-0x0000000075A31000-0x0000000075A33000-memory.dmpFilesize
8KB
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memory/1080-63-0x0000000000270000-0x0000000000272000-memory.dmpFilesize
8KB
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memory/1660-70-0x0000000000000000-mapping.dmp
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memory/2036-61-0x000000000040717B-mapping.dmp
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memory/2036-64-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB