Analysis Overview
SHA256
60d1297adb502d942493a794945336aea891d2c321476ef3349ac07726fca7c3
Threat Level: Known bad
The file 7536b74c17754363799df14fe70d3a92.exe was found to be: Known bad.
Malicious Activity Summary
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
Downloads MZ/PE file
Deletes itself
Loads dropped DLL
Reads user/profile data of web browsers
Checks installed software on the system
Accesses cryptocurrency files/wallets, possible credential harvesting
Suspicious use of SetThreadContext
Enumerates physical storage devices
Suspicious behavior: EnumeratesProcesses
Checks processor information in registry
Suspicious use of AdjustPrivilegeToken
Kills process with taskkill
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V6
Analysis: static1
Detonation Overview
Reported
2021-08-03 11:03
Signatures
Analysis: behavioral1
Detonation Overview
Submitted
2021-08-03 11:03
Reported
2021-08-03 11:05
Platform
win7v20210410
Max time kernel
118s
Max time network
120s
Command Line
Signatures
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
Downloads MZ/PE file
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\cmd.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
Reads user/profile data of web browsers
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1048 set thread context of 240 | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe |
Enumerates physical storage devices
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
Kills process with taskkill
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\taskkill.exe | N/A |
Suspicious behavior: EnumeratesProcesses
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\taskkill.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe
"C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe"
C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe
"C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe"
C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe
"C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 240 & erase C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe & RD /S /Q C:\\ProgramData\\589255945486881\\* & exit
C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 240
Network
| Country | Destination | Domain | Proto |
| N/A | 2.56.59.226:80 | 2.56.59.226 | tcp |
Files
memory/1048-60-0x0000000001240000-0x0000000001241000-memory.dmp
memory/1048-62-0x00000000011E0000-0x00000000011E1000-memory.dmp
memory/1048-63-0x00000000003E0000-0x00000000003ED000-memory.dmp
memory/1048-64-0x0000000005760000-0x00000000057FD000-memory.dmp
memory/1048-65-0x0000000000670000-0x00000000006A6000-memory.dmp
memory/240-67-0x000000000040717B-mapping.dmp
memory/240-66-0x0000000000400000-0x0000000000438000-memory.dmp
memory/240-68-0x0000000075721000-0x0000000075723000-memory.dmp
memory/240-69-0x0000000000400000-0x0000000000438000-memory.dmp
\ProgramData\sqlite3.dll
| MD5 | e477a96c8f2b18d6b5c27bde49c990bf |
| SHA1 | e980c9bf41330d1e5bd04556db4646a0210f7409 |
| SHA256 | 16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660 |
| SHA512 | 335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c |
\ProgramData\nss3.dll
| MD5 | bfac4e3c5908856ba17d41edcd455a51 |
| SHA1 | 8eec7e888767aa9e4cca8ff246eb2aacb9170428 |
| SHA256 | e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78 |
| SHA512 | 2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66 |
\ProgramData\mozglue.dll
| MD5 | 8f73c08a9660691143661bf7332c3c27 |
| SHA1 | 37fa65dd737c50fda710fdbde89e51374d0c204a |
| SHA256 | 3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd |
| SHA512 | 0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89 |
\ProgramData\msvcp140.dll
| MD5 | 109f0f02fd37c84bfc7508d4227d7ed5 |
| SHA1 | ef7420141bb15ac334d3964082361a460bfdb975 |
| SHA256 | 334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4 |
| SHA512 | 46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39 |
\ProgramData\vcruntime140.dll
| MD5 | 7587bf9cb4147022cd5681b015183046 |
| SHA1 | f2106306a8f6f0da5afb7fc765cfa0757ad5a628 |
| SHA256 | c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d |
| SHA512 | 0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f |
memory/340-75-0x0000000000000000-mapping.dmp
memory/1556-76-0x0000000000000000-mapping.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2021-08-03 11:03
Reported
2021-08-03 11:05
Platform
win10v20210408
Max time kernel
55s
Max time network
136s
Command Line
Signatures
Oski
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
Downloads MZ/PE file
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
Reads user/profile data of web browsers
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 3128 set thread context of 3476 | N/A | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe |
Enumerates physical storage devices
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe | N/A |
Kills process with taskkill
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\taskkill.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Windows\SysWOW64\taskkill.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe
"C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe"
C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe
"C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 3476 & erase C:\Users\Admin\AppData\Local\Temp\7536b74c17754363799df14fe70d3a92.exe & RD /S /Q C:\\ProgramData\\988647133445575\\* & exit
C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 3476
Network
| Country | Destination | Domain | Proto |
| N/A | 2.56.59.226:80 | 2.56.59.226 | tcp |
Files
memory/3128-114-0x0000000000120000-0x0000000000121000-memory.dmp
memory/3128-116-0x0000000004A40000-0x0000000004A41000-memory.dmp
memory/3128-117-0x0000000005030000-0x0000000005031000-memory.dmp
memory/3128-118-0x0000000004BD0000-0x0000000004BD1000-memory.dmp
memory/3128-119-0x0000000004B30000-0x000000000502E000-memory.dmp
memory/3128-120-0x0000000004A20000-0x0000000004A21000-memory.dmp
memory/3128-121-0x0000000004D70000-0x0000000004D71000-memory.dmp
memory/3128-122-0x0000000004BC0000-0x0000000004BCD000-memory.dmp
memory/3128-123-0x00000000072D0000-0x000000000736D000-memory.dmp
memory/3128-124-0x0000000004500000-0x0000000004536000-memory.dmp
memory/3476-126-0x000000000040717B-mapping.dmp
memory/3476-125-0x0000000000400000-0x0000000000438000-memory.dmp
memory/3476-127-0x0000000000400000-0x0000000000438000-memory.dmp
\ProgramData\sqlite3.dll
| MD5 | e477a96c8f2b18d6b5c27bde49c990bf |
| SHA1 | e980c9bf41330d1e5bd04556db4646a0210f7409 |
| SHA256 | 16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660 |
| SHA512 | 335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c |
\ProgramData\nss3.dll
| MD5 | bfac4e3c5908856ba17d41edcd455a51 |
| SHA1 | 8eec7e888767aa9e4cca8ff246eb2aacb9170428 |
| SHA256 | e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78 |
| SHA512 | 2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66 |
\ProgramData\mozglue.dll
| MD5 | 8f73c08a9660691143661bf7332c3c27 |
| SHA1 | 37fa65dd737c50fda710fdbde89e51374d0c204a |
| SHA256 | 3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd |
| SHA512 | 0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89 |
memory/2696-131-0x0000000000000000-mapping.dmp
memory/3472-132-0x0000000000000000-mapping.dmp