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Analysis
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max time kernel
69s -
max time network
81s -
platform
windows7_x64 -
resource
win7-20220812-en -
resource tags
arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system -
submitted
01/09/2022, 08:26
Static task
static1
Behavioral task
behavioral1
Sample
Invoice.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
Invoice.exe
Resource
win10v2004-20220812-en
General
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Target
Invoice.exe
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Size
974KB
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MD5
288e1e9a0d79b265aaf409a1c39b67dd
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SHA1
daccc93545a168dcb69dd8b18ab01ca1f4a68cbc
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SHA256
95bb38f864cb2a18cc598ce238ef85dc5eae8de91c0f2e58c175460fc8ebe94d
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SHA512
1dedd914fdf8bb966525bb951a348a61ab91d1f1384fb035034eac07d331c09bc460f88cd9412c677998b9bf84a2b6e1d99f2c64e0b79a8a1976b11a9481641b
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SSDEEP
24576:jZ5hSCAlqmCXyvuDdGBGwZcZoyMgvN6QAJXY+mzo3bv:d5hStqmSycYGayMgl6QUlmzM
Malware Config
Extracted
oski
v.m-fit.biz
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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Deletes itself 1 IoCs
pid Process 1160 cmd.exe -
Loads dropped DLL 3 IoCs
pid Process 1568 Invoice.exe 1568 Invoice.exe 1568 Invoice.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
description pid Process procid_target PID 2008 set thread context of 1568 2008 Invoice.exe 27 -
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.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString Invoice.exe -
Kills process with taskkill 1 IoCs
pid Process 1056 taskkill.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 1056 taskkill.exe -
Suspicious use of WriteProcessMemory 18 IoCs
description pid Process procid_target PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 2008 wrote to memory of 1568 2008 Invoice.exe 27 PID 1568 wrote to memory of 1160 1568 Invoice.exe 30 PID 1568 wrote to memory of 1160 1568 Invoice.exe 30 PID 1568 wrote to memory of 1160 1568 Invoice.exe 30 PID 1568 wrote to memory of 1160 1568 Invoice.exe 30 PID 1160 wrote to memory of 1056 1160 cmd.exe 32 PID 1160 wrote to memory of 1056 1160 cmd.exe 32 PID 1160 wrote to memory of 1056 1160 cmd.exe 32 PID 1160 wrote to memory of 1056 1160 cmd.exe 32
Processes
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C:\Users\Admin\AppData\Local\Temp\Invoice.exe"C:\Users\Admin\AppData\Local\Temp\Invoice.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2008 -
C:\Users\Admin\AppData\Local\Temp\Invoice.exe"C:\Users\Admin\AppData\Local\Temp\Invoice.exe"2⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1568 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 1568 & erase C:\Users\Admin\AppData\Local\Temp\Invoice.exe & RD /S /Q C:\\ProgramData\\127208953899843\\* & exit3⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:1160 -
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 15684⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1056
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
133KB
MD58f73c08a9660691143661bf7332c3c27
SHA137fa65dd737c50fda710fdbde89e51374d0c204a
SHA2563fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd
SHA5120042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89
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Filesize
1.2MB
MD5bfac4e3c5908856ba17d41edcd455a51
SHA18eec7e888767aa9e4cca8ff246eb2aacb9170428
SHA256e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78
SHA5122565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66
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Filesize
630KB
MD5e477a96c8f2b18d6b5c27bde49c990bf
SHA1e980c9bf41330d1e5bd04556db4646a0210f7409
SHA25616574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660
SHA512335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c