kutaki | 0392b3c77ea02a9d0ab0a5802b0a8880989a1afd0a74cdbfe6bf540c92cfda1f

Analysis

max time kernel
127s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
24/09/2022, 04:43

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General

Target
JTF.exe
Size 368KB
Sample220924-fb83wsaeg9
SHA256 2a912155052a824834d135b4d4e76d05287070c5141311b9a86e54ddbde13268
MD5 9cb5c7e9ff6a1ebadffdf841e4b0c365
SHA1 d84cd78c91fb38976dbcd2a215aa1c04683b0b86
SHA512 32cf5449200fae46a22196901dd2c25cd2da3c9611aaddbb589e49518b80f7a77d1371e76174b9868782fb6688a910006fafcfca0c92dbdf3aae1ae97fe83d69
SSDEEP 6144:tL0Vwc4W4Es+CS/wUcvzUjSa5pK2mKdl0TruunfD09gfJChgGJhCj:tL0aB4/8vYjDpK8atfx8hDu
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

kutaki keylogger stealer

Malware Config

Extracted

Family

kutaki

http://newbosslink.xyz/baba/new4.php

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/0x0009000000000705-137.dat	family_kutaki
behavioral2/files/0x0009000000000705-138.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
4216	ch.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	cmd.exe

Drops startup file 2 IoCs

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

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	mspaint.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4300	mspaint.exe
4300	mspaint.exe

Suspicious use of SetWindowsHookEx 10 IoCs

pid	Process
2064	JTF.exe
2064	JTF.exe
2064	JTF.exe
4300	mspaint.exe
4216	ch.exe
4300	mspaint.exe
4216	ch.exe
4216	ch.exe
4300	mspaint.exe
4300	mspaint.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2064 wrote to memory of 2092	2064	JTF.exe	77
PID 2064 wrote to memory of 2092	2064	JTF.exe	77
PID 2064 wrote to memory of 2092	2064	JTF.exe	77
PID 2092 wrote to memory of 4300	2092	cmd.exe	79
PID 2092 wrote to memory of 4300	2092	cmd.exe	79
PID 2092 wrote to memory of 4300	2092	cmd.exe	79
PID 2064 wrote to memory of 4216	2064	JTF.exe	83
PID 2064 wrote to memory of 4216	2064	JTF.exe	83
PID 2064 wrote to memory of 4216	2064	JTF.exe	83

C:\Users\Admin\AppData\Local\Temp\JTF.exe
"C:\Users\Admin\AppData\Local\Temp\JTF.exe"
1⤵
- Drops startup file
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2064
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
  2⤵
  - Checks computer location settings
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2092
- - C:\Windows\SysWOW64\mspaint.exe
    "C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp"
    3⤵
    - Drops file in Windows directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:4300
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetWindowsHookEx
  PID:4216

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
1⤵
PID:4432

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

ch.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe
Size 368KB
SHA256 2a912155052a824834d135b4d4e76d05287070c5141311b9a86e54ddbde13268
MD5 9cb5c7e9ff6a1ebadffdf841e4b0c365
SHA1 d84cd78c91fb38976dbcd2a215aa1c04683b0b86
SHA512 32cf5449200fae46a22196901dd2c25cd2da3c9611aaddbb589e49518b80f7a77d1371e76174b9868782fb6688a910006fafcfca0c92dbdf3aae1ae97fe83d69
SSDEEP 6144:tL0Vwc4W4Es+CS/wUcvzUjSa5pK2mKdl0TruunfD09gfJChgGJhCj:tL0aB4/8vYjDpK8atfx8hDu
MD5 SHA1 SHA512 SSDEEP

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ch.exe

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ch.exe
Size 368KB
SHA256 2a912155052a824834d135b4d4e76d05287070c5141311b9a86e54ddbde13268
MD5 9cb5c7e9ff6a1ebadffdf841e4b0c365
SHA1 d84cd78c91fb38976dbcd2a215aa1c04683b0b86
SHA512 32cf5449200fae46a22196901dd2c25cd2da3c9611aaddbb589e49518b80f7a77d1371e76174b9868782fb6688a910006fafcfca0c92dbdf3aae1ae97fe83d69
SSDEEP 6144:tL0Vwc4W4Es+CS/wUcvzUjSa5pK2mKdl0TruunfD09gfJChgGJhCj:tL0aB4/8vYjDpK8atfx8hDu
MD5 SHA1 SHA512 SSDEEP

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