Analysis
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max time kernel
67s -
max time network
126s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
19-04-2021 12:01
Static task
static1
Behavioral task
behavioral1
Sample
Pvcjjru.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
Pvcjjru.exe
Resource
win10v20210408
General
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Target
Pvcjjru.exe
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Size
266KB
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MD5
6581f25476a8e4009877ba7498489ef6
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SHA1
dbacf300333c598ebd34e57228efc569cadee154
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SHA256
808910839d0446439d58dbff8bf7d36db24892fb0ebd018a9dcafc24ddd9d34c
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SHA512
11cbd153b5d1e53f8c758b616889fd6e2ce5f0e4533daa6c7fd04e41ae740a194378b12c3768ca62b5eb01d2a55f34fb99f28a42b8a7e9380d7b277b4b039add
Malware Config
Extracted
oski
novget.com
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:
Pvcjjru.exepid process 1200 Pvcjjru.exe 1200 Pvcjjru.exe 1200 Pvcjjru.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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Adds Run key to start application 2 TTPs 1 IoCs
Processes:
Pvcjjru.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\note = "\"C:\\Users\\Admin\\AppData\\Local\\note.exe\"" Pvcjjru.exe -
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:
Pvcjjru.exedescription pid process target process PID 784 set thread context of 1200 784 Pvcjjru.exe Pvcjjru.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:
Pvcjjru.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString Pvcjjru.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 1908 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
Pvcjjru.exepid process 784 Pvcjjru.exe 784 Pvcjjru.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Pvcjjru.exetaskkill.exedescription pid process Token: SeDebugPrivilege 784 Pvcjjru.exe Token: SeDebugPrivilege 1908 taskkill.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
Pvcjjru.exePvcjjru.execmd.exedescription pid process target process PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 784 wrote to memory of 1200 784 Pvcjjru.exe Pvcjjru.exe PID 1200 wrote to memory of 3988 1200 Pvcjjru.exe cmd.exe PID 1200 wrote to memory of 3988 1200 Pvcjjru.exe cmd.exe PID 1200 wrote to memory of 3988 1200 Pvcjjru.exe cmd.exe PID 3988 wrote to memory of 1908 3988 cmd.exe taskkill.exe PID 3988 wrote to memory of 1908 3988 cmd.exe taskkill.exe PID 3988 wrote to memory of 1908 3988 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Pvcjjru.exe"C:\Users\Admin\AppData\Local\Temp\Pvcjjru.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\Pvcjjru.exeC:\Users\Admin\AppData\Local\Temp\Pvcjjru.exe2⤵
- 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 1200 & erase C:\Users\Admin\AppData\Local\Temp\Pvcjjru.exe & RD /S /Q C:\\ProgramData\\565274512131613\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 12004⤵
- 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/784-114-0x0000000000460000-0x0000000000461000-memory.dmpFilesize
4KB
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memory/784-116-0x0000000000E30000-0x0000000000E32000-memory.dmpFilesize
8KB
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memory/784-117-0x0000000004E40000-0x0000000004E41000-memory.dmpFilesize
4KB
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memory/784-118-0x00000000057D0000-0x0000000005811000-memory.dmpFilesize
260KB
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memory/1200-119-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1200-120-0x000000000040717B-mapping.dmp
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memory/1200-121-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/1908-126-0x0000000000000000-mapping.dmp
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memory/3988-125-0x0000000000000000-mapping.dmp