Analysis
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max time kernel
72s -
max time network
112s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
07-05-2021 11:01
Static task
static1
Behavioral task
behavioral1
Sample
Zguzieszn.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
Zguzieszn.exe
Resource
win10v20210408
General
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Target
Zguzieszn.exe
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Size
258KB
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MD5
24e9df3d16780b449b0ec80f25c263b7
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SHA1
b410b497a791b962e8b9e11b605c291492e542b6
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SHA256
04739bba7ef80f72f47dd22eb66b9fddb6f48b5c3744b1f9cc6018615aa11bd6
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SHA512
4a790485ce2f2e2a92892afc948448162fc08e6e5d352281bd3dbfa12cee44635a838f312197e9be27b12550081ed34b21a839cb805efde0c7365102aad03cd2
Malware Config
Extracted
oski
198.98.49.140
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:
Zguzieszn.exepid process 2312 Zguzieszn.exe 2312 Zguzieszn.exe 2312 Zguzieszn.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:
Zguzieszn.exedescription pid process target process PID 604 set thread context of 2312 604 Zguzieszn.exe Zguzieszn.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:
Zguzieszn.exedescription ioc process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString Zguzieszn.exe -
Kills process with taskkill 1 IoCs
Processes:
taskkill.exepid process 2180 taskkill.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
Processes:
Zguzieszn.exepid process 604 Zguzieszn.exe 604 Zguzieszn.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Zguzieszn.exetaskkill.exedescription pid process Token: SeDebugPrivilege 604 Zguzieszn.exe Token: SeDebugPrivilege 2180 taskkill.exe -
Suspicious use of WriteProcessMemory 15 IoCs
Processes:
Zguzieszn.exeZguzieszn.execmd.exedescription pid process target process PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 604 wrote to memory of 2312 604 Zguzieszn.exe Zguzieszn.exe PID 2312 wrote to memory of 3468 2312 Zguzieszn.exe cmd.exe PID 2312 wrote to memory of 3468 2312 Zguzieszn.exe cmd.exe PID 2312 wrote to memory of 3468 2312 Zguzieszn.exe cmd.exe PID 3468 wrote to memory of 2180 3468 cmd.exe taskkill.exe PID 3468 wrote to memory of 2180 3468 cmd.exe taskkill.exe PID 3468 wrote to memory of 2180 3468 cmd.exe taskkill.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Zguzieszn.exe"C:\Users\Admin\AppData\Local\Temp\Zguzieszn.exe"1⤵
- 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\Zguzieszn.exeC:\Users\Admin\AppData\Local\Temp\Zguzieszn.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 2312 & erase C:\Users\Admin\AppData\Local\Temp\Zguzieszn.exe & RD /S /Q C:\\ProgramData\\031228481576330\\* & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 23124⤵
- 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\nss3.dllMD5
bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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\ProgramData\sqlite3.dllMD5
e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c
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memory/604-118-0x0000000004F60000-0x0000000004F61000-memory.dmpFilesize
4KB
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memory/604-119-0x0000000004EE0000-0x0000000004EE1000-memory.dmpFilesize
4KB
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memory/604-120-0x0000000005000000-0x0000000005032000-memory.dmpFilesize
200KB
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memory/604-114-0x0000000000660000-0x0000000000661000-memory.dmpFilesize
4KB
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memory/604-117-0x0000000000D40000-0x0000000000D42000-memory.dmpFilesize
8KB
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memory/604-116-0x0000000005130000-0x0000000005131000-memory.dmpFilesize
4KB
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memory/2180-128-0x0000000000000000-mapping.dmp
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memory/2312-121-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/2312-122-0x000000000040717B-mapping.dmp
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memory/2312-123-0x0000000000400000-0x0000000000438000-memory.dmpFilesize
224KB
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memory/3468-127-0x0000000000000000-mapping.dmp