kutaki | 53e5bb2398ff5857e45c9ebeb3fe9bfd0a8d6a4809321582739bba553b66879c

Analysis

max time kernel
152s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
26/07/2022, 18:40

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General

Target
Tax Payment Challan.exe
Size 795KB
Sample220726-xbb7lagag7
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6
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/0x0009000000022e6c-134.dat	family_kutaki
behavioral2/files/0x0009000000022e6c-135.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
4460	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	Tax Payment Challan.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe	Tax Payment Challan.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
1296	Tax Payment Challan.exe
1296	Tax Payment Challan.exe
1296	Tax Payment Challan.exe
4460	hyuder.exe
4460	hyuder.exe
4460	hyuder.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1296 wrote to memory of 4372	1296	Tax Payment Challan.exe	80
PID 1296 wrote to memory of 4372	1296	Tax Payment Challan.exe	80
PID 1296 wrote to memory of 4372	1296	Tax Payment Challan.exe	80
PID 1296 wrote to memory of 4460	1296	Tax Payment Challan.exe	84
PID 1296 wrote to memory of 4460	1296	Tax Payment Challan.exe	84
PID 1296 wrote to memory of 4460	1296	Tax Payment Challan.exe	84

C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe
"C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1296
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\
  2⤵
  PID:4372
- 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:4460

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

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 795KB
SHA256 bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
MD5 17c53a651b72616b46ecb8f5215ed009
SHA1 c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA512 c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6
SSDEEP 12288:XHSWNBEEEEEEEEEEEEmP0l9LmmvTpp+5NvHzlK7KqufBEVlEpTfTdTrTKTXTcTff:z9LmmrYrIRqrlSpnHuGE5
MD5 SHA1 SHA512 SSDEEP

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