Analysis
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max time kernel
81s -
max time network
122s -
platform
windows10_x64 -
resource
win10-en-20211208 -
submitted
01-01-2022 13:53
Static task
static1
Behavioral task
behavioral1
Sample
null.exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
null.exe
Resource
win10-en-20211208
General
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Target
null.exe
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Size
343KB
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MD5
0c9fbe2b8445f43a1407508f609a65c5
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SHA1
10dc04753f38e7e6050deff40a6a021e66211010
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SHA256
64a44191e52ba66f1a7c4e35a2911d0aadda5f4678f513fa6d1a8a1dfa3c910e
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SHA512
fe22b9ae47bef7d9e3e35e805dbbe1e99c0880770d018d224574930da1343770d758c342242caa8a0347329c73230a5e5808788a05abdd07eb1ebf0dd1600253
Malware Config
Extracted
arkei
homesteadr
http://homesteadr.link/ggate.php
Signatures
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Arkei Stealer Payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/3988-116-0x00000000001C0000-0x00000000001DC000-memory.dmp family_arkei behavioral2/memory/3988-117-0x0000000000400000-0x0000000000783000-memory.dmp family_arkei -
Downloads MZ/PE file
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Loads dropped DLL 3 IoCs
Processes:
null.exepid process 3988 null.exe 3988 null.exe 3988 null.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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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 2 IoCs
Processor information is often read in order to detect sandboxing environments.
Processes:
null.exedescription ioc process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 null.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString null.exe -
Delays execution with timeout.exe 1 IoCs
Processes:
timeout.exepid process 1648 timeout.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
null.execmd.exedescription pid process target process PID 3988 wrote to memory of 3984 3988 null.exe cmd.exe PID 3988 wrote to memory of 3984 3988 null.exe cmd.exe PID 3988 wrote to memory of 3984 3988 null.exe cmd.exe PID 3984 wrote to memory of 1648 3984 cmd.exe timeout.exe PID 3984 wrote to memory of 1648 3984 cmd.exe timeout.exe PID 3984 wrote to memory of 1648 3984 cmd.exe timeout.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\null.exe"C:\Users\Admin\AppData\Local\Temp\null.exe"1⤵
- 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 timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\null.exe" & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 53⤵
- Delays execution with timeout.exe
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/1648-122-0x0000000000000000-mapping.dmp
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memory/3984-121-0x0000000000000000-mapping.dmp
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memory/3988-116-0x00000000001C0000-0x00000000001DC000-memory.dmpFilesize
112KB
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memory/3988-117-0x0000000000400000-0x0000000000783000-memory.dmpFilesize
3.5MB