Analysis
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max time kernel
48s -
max time network
125s -
platform
windows10_x64 -
resource
win10v20210410 -
submitted
06-07-2021 09:01
Static task
static1
Behavioral task
behavioral1
Sample
00001effb01cec7a867b5ccae0325fe1.exe
Resource
win7v20210410
General
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Target
00001effb01cec7a867b5ccae0325fe1.exe
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Size
841KB
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MD5
00001effb01cec7a867b5ccae0325fe1
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SHA1
b739d4641afc15cb9b63a39bdc9c3a9b9cd05f01
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SHA256
6b95b02847bc1eae8b9b97da0cecb7f85f554314ecbea6affe44319ef1b5206b
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SHA512
6eb45861358cfb3e94a220dc632f8d2f12d357a4134c99dbdb5265ae3a768f93396b3d9973a93aca04deb9129e73ce176fe94a1d6dfe7d30374bd2730e6b6a2e
Malware Config
Extracted
oski
37.0.11.237/az/
Signatures
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Oski
Oski is an infostealer targeting browser data, crypto wallets.
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Looks for VirtualBox Guest Additions in registry 2 TTPs
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Downloads MZ/PE file
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Looks for VMWare Tools registry key 2 TTPs
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Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
Processes:
00001effb01cec7a867b5ccae0325fe1.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion 00001effb01cec7a867b5ccae0325fe1.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion 00001effb01cec7a867b5ccae0325fe1.exe -
Loads dropped DLL 3 IoCs
Processes:
00001effb01cec7a867b5ccae0325fe1.exepid process 1224 00001effb01cec7a867b5ccae0325fe1.exe 1224 00001effb01cec7a867b5ccae0325fe1.exe 1224 00001effb01cec7a867b5ccae0325fe1.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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Maps connected drives based on registry 3 TTPs 2 IoCs
Disk information is often read in order to detect sandboxing environments.
Processes:
00001effb01cec7a867b5ccae0325fe1.exedescription ioc process Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum\0 00001effb01cec7a867b5ccae0325fe1.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum 00001effb01cec7a867b5ccae0325fe1.exe -
Suspicious use of SetThreadContext 1 IoCs
Processes:
00001effb01cec7a867b5ccae0325fe1.exedescription pid process target process PID 3724 set thread context of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.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:
00001effb01cec7a867b5ccae0325fe1.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString 00001effb01cec7a867b5ccae0325fe1.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1428 taskkill.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
taskkill.exedescription pid process Token: SeDebugPrivilege 1428 taskkill.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
00001effb01cec7a867b5ccae0325fe1.exe00001effb01cec7a867b5ccae0325fe1.execmd.exedescription pid process target process PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 3724 wrote to memory of 1224 3724 00001effb01cec7a867b5ccae0325fe1.exe 00001effb01cec7a867b5ccae0325fe1.exe PID 1224 wrote to memory of 1608 1224 00001effb01cec7a867b5ccae0325fe1.exe cmd.exe PID 1224 wrote to memory of 1608 1224 00001effb01cec7a867b5ccae0325fe1.exe cmd.exe PID 1224 wrote to memory of 1608 1224 00001effb01cec7a867b5ccae0325fe1.exe cmd.exe PID 1608 wrote to memory of 1428 1608 cmd.exe taskkill.exe PID 1608 wrote to memory of 1428 1608 cmd.exe taskkill.exe PID 1608 wrote to memory of 1428 1608 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe"C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe"1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3724 -
C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe"C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe"2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1224 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 1224 & erase C:\Users\Admin\AppData\Local\Temp\00001effb01cec7a867b5ccae0325fe1.exe & RD /S /Q C:\\ProgramData\\573564437120799\\* & exit3⤵
- Suspicious use of WriteProcessMemory
PID:1608 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 12244⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1428
Network
MITRE ATT&CK Enterprise 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/1224-127-0x000000000040717B-mapping.dmp
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memory/1224-128-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1224-126-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1428-133-0x0000000000000000-mapping.dmp
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memory/1608-132-0x0000000000000000-mapping.dmp
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memory/3724-119-0x0000000005000000-0x0000000005001000-memory.dmpFilesize
4KB
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memory/3724-124-0x000000000AF70000-0x000000000AFB9000-memory.dmpFilesize
292KB
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memory/3724-125-0x000000000E030000-0x000000000E031000-memory.dmpFilesize
4KB
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memory/3724-123-0x0000000008900000-0x000000000897E000-memory.dmpFilesize
504KB
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memory/3724-122-0x0000000005440000-0x000000000544F000-memory.dmpFilesize
60KB
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memory/3724-121-0x0000000005020000-0x000000000551E000-memory.dmpFilesize
5.0MB
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memory/3724-120-0x0000000005220000-0x0000000005221000-memory.dmpFilesize
4KB
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memory/3724-114-0x0000000000680000-0x0000000000681000-memory.dmpFilesize
4KB
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memory/3724-118-0x00000000050C0000-0x00000000050C1000-memory.dmpFilesize
4KB
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memory/3724-117-0x0000000005520000-0x0000000005521000-memory.dmpFilesize
4KB
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memory/3724-116-0x0000000004F50000-0x0000000004F51000-memory.dmpFilesize
4KB