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Analysis
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max time kernel
29s -
max time network
34s -
platform
windows7_x64 -
resource
win7-20230220-es -
resource tags
arch:x64arch:x86image:win7-20230220-eslocale:es-esos:windows7-x64systemwindows -
submitted
19/05/2023, 03:22
Static task
static1
Behavioral task
behavioral1
Sample
cpuz_x32.exe
Resource
win7-20230220-es
General
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Target
cpuz_x32.exe
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Size
3.9MB
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MD5
0dbdfcdd8adedec00b361bb55abc80c1
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SHA1
919cfad29c2a46c94c1866fb9d98c2eb68c95b96
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SHA256
986256a9b917d0c5026c7dc11b694b6e7419ab267ad9c7971486e7e24db5e80e
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SHA512
960e048c548d45ed27fb889bfdcbc38705b37ab79809a2dfc4241f82b59b4e32f7864f8df8be6e7ca86f34429f36e0878993b21a280289e35c0a0ee27f1d959e
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SSDEEP
49152:jstvckjdrGs6EbKvynYYTfMpItLc8aOm7s+TguV:j6ckBr/Yvya427hTgA
Malware Config
Signatures
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Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
description ioc Process File opened for modification \??\PhysicalDrive0 cpuz_x32.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Program crash 1 IoCs
pid pid_target Process procid_target 1708 1760 WerFault.exe 27 -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 632 NOTEPAD.EXE -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 1760 cpuz_x32.exe 1760 cpuz_x32.exe -
Suspicious behavior: LoadsDriver 2 IoCs
pid Process 416 Process not Found 416 Process not Found -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeLoadDriverPrivilege 1760 cpuz_x32.exe Token: SeLoadDriverPrivilege 1760 cpuz_x32.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 1760 cpuz_x32.exe 1760 cpuz_x32.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 1760 wrote to memory of 632 1760 cpuz_x32.exe 28 PID 1760 wrote to memory of 632 1760 cpuz_x32.exe 28 PID 1760 wrote to memory of 632 1760 cpuz_x32.exe 28 PID 1760 wrote to memory of 632 1760 cpuz_x32.exe 28 PID 1760 wrote to memory of 1708 1760 cpuz_x32.exe 32 PID 1760 wrote to memory of 1708 1760 cpuz_x32.exe 32 PID 1760 wrote to memory of 1708 1760 cpuz_x32.exe 32 PID 1760 wrote to memory of 1708 1760 cpuz_x32.exe 32
Processes
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C:\Users\Admin\AppData\Local\Temp\cpuz_x32.exe"C:\Users\Admin\AppData\Local\Temp\cpuz_x32.exe"1⤵
- Writes to the Master Boot Record (MBR)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1760 -
C:\Windows\SysWOW64\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Windows\temp\cpuz_driver_1760.log2⤵
- Opens file in notepad (likely ransom note)
PID:632
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1760 -s 10402⤵
- Program crash
PID:1708
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
1KB
MD5e2e93ee3506ea9787fc2a9decb47ad39
SHA191747729fe885b0461d6e226cb9202443a383b71
SHA256fd37800da55d0ea296e5a27a92fadf197023c6bd2cefc033fb0a854b1361dca2
SHA51220b698c591ac23f4f458902c3231fd14c7a9a5a25af0bb75c6d4639c4039641cfdccbd52c1d313835c1cb755518aaba81e2317656e9fd7eef451a3d9850b30df
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Filesize
2KB
MD57eb841729f9349c3fc0ea6fc116b674f
SHA1f12087c95f81504d9e9cb2208a3adc4e72115504
SHA25680403171dbdff3603e47f576aabe5c4f978d59fd293fd07df7f22d2097062ec0
SHA512d15eeb0ec4d5f8c687cd730b813a82345e79a3ae1883042498184f4deda6dec93750024850da8310e532b5e34c24c07fa49aabc2ece7a6c6eeae9297e298715c