kutaki | a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050

General

Target
a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe
Size 755KB
Sample220708-y7dwqsffaj
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a
MD5 SHA1 SHA512

Score

10^/10

kutaki keylogger stealer

Malware Config

Signatures

Kutaki
Information stealer and keylogger that hides inside legitimate Visual Basic applications.
stealer keylogger kutaki

Kutaki Executable 2 IoCs

resource	yara_rule
behavioral2/files/0x000c00000001e5c0-134.dat	family_kutaki
behavioral2/files/0x000c00000001e5c0-135.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
4516	hyuder.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	hyuder.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	hyuder.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 6 IoCs

pid	Process
752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe
752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe
752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe
4516	hyuder.exe
4516	hyuder.exe
4516	hyuder.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 752 wrote to memory of 4720	752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe	81
PID 752 wrote to memory of 4720	752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe	81
PID 752 wrote to memory of 4720	752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe	81
PID 752 wrote to memory of 4516	752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe	91
PID 752 wrote to memory of 4516	752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe	91
PID 752 wrote to memory of 4516	752	a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe	91

C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe
"C:\Users\Admin\AppData\Local\Temp\a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:752
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\
  2⤵
  PID:4720
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe"
  2⤵
  - Executes dropped EXE
  - Maps connected drives based on registry
  - Suspicious use of SetWindowsHookEx
  PID:4516

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

hyuder.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
Size 755KB
SHA256 a09fd5ecf91fcdc892b38fb7fb356a972134863f8b639f307d01d688d2e3c050
MD5 645be265d5378cdfdda8a059a228b9a2
SHA1 2d7816de252f0881583fce21ccd4ef2e9bfe1dff
SHA512 55ccb2dfdf6776550bda7b476bdaac6ba6dac2d97f215d57b0e164544befbabb8732006cc1d8920452553f38dc453f497266d12d184bee79bb2ce3f5c7702f7a
SSDEEP 12288:TXJT7lzwFAvBzK61oORotpGPqlSpwhm4s5bsGSCs5:T5T7lzwFAvBzK61oORotrlSpnHuGE5
MD5 SHA1 SHA512 SSDEEP

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