kutaki | ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb

Analysis

max time kernel
151s
max time network
44s
platform
windows7_x64
resource
win7-20220414-en
submitted
09/06/2022, 08:59

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General

Target

ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
Size

496KB
MD5

9ca01142589187736ef32d73d28973e0
SHA1

307faa96f8186c56e8f670860190e08129d43b5b
SHA256

ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb
SHA512

9ad4906cd5ac83dbcbbe2bf875eb196ddc82d423ddc58c92feb44039d1f0620bfc26ba330eb4afd31d3a14d8094fb21ba30beb6ceba8f5980cf82e59252332de

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 4 IoCs

resource	yara_rule
behavioral1/files/0x000a000000003c9f-58.dat	family_kutaki
behavioral1/files/0x000a000000003c9f-61.dat	family_kutaki
behavioral1/files/0x000a000000003c9f-59.dat	family_kutaki
behavioral1/files/0x000a000000003c9f-66.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
828	erargxch.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe

Loads dropped DLL 2 IoCs

pid	Process
1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.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	erargxch.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	erargxch.exe

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

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1083475884-596052423-1669053738-1000\Software\Microsoft\Internet Explorer\Main	erargxch.exe

Suspicious use of SetWindowsHookEx 64 IoCs

pid	Process
1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe
828	erargxch.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1444 wrote to memory of 1652	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	29
PID 1444 wrote to memory of 1652	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	29
PID 1444 wrote to memory of 1652	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	29
PID 1444 wrote to memory of 1652	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	29
PID 1444 wrote to memory of 828	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	31
PID 1444 wrote to memory of 828	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	31
PID 1444 wrote to memory of 828	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	31
PID 1444 wrote to memory of 828	1444	ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe	31

C:\Users\Admin\AppData\Local\Temp\ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe
"C:\Users\Admin\AppData\Local\Temp\ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1444
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\
  2⤵
  PID:1652
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe"
  2⤵
  - Executes dropped EXE
  - Maps connected drives based on registry
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:828

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

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

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe

Filesize
496KB

MD5
9ca01142589187736ef32d73d28973e0

SHA1
307faa96f8186c56e8f670860190e08129d43b5b

SHA256
ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb

SHA512
9ad4906cd5ac83dbcbbe2bf875eb196ddc82d423ddc58c92feb44039d1f0620bfc26ba330eb4afd31d3a14d8094fb21ba30beb6ceba8f5980cf82e59252332de

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe

Filesize
496KB

MD5
9ca01142589187736ef32d73d28973e0

SHA1
307faa96f8186c56e8f670860190e08129d43b5b

SHA256
ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb

SHA512
9ad4906cd5ac83dbcbbe2bf875eb196ddc82d423ddc58c92feb44039d1f0620bfc26ba330eb4afd31d3a14d8094fb21ba30beb6ceba8f5980cf82e59252332de

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe

Filesize
496KB

MD5
9ca01142589187736ef32d73d28973e0

SHA1
307faa96f8186c56e8f670860190e08129d43b5b

SHA256
ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb

SHA512
9ad4906cd5ac83dbcbbe2bf875eb196ddc82d423ddc58c92feb44039d1f0620bfc26ba330eb4afd31d3a14d8094fb21ba30beb6ceba8f5980cf82e59252332de

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\erargxch.exe

Filesize
496KB

MD5
9ca01142589187736ef32d73d28973e0

SHA1
307faa96f8186c56e8f670860190e08129d43b5b

SHA256
ac9fec69ac45137f4fc44b568af643e9dc34724e8a110d1f028650fe8e5914bb

SHA512
9ad4906cd5ac83dbcbbe2bf875eb196ddc82d423ddc58c92feb44039d1f0620bfc26ba330eb4afd31d3a14d8094fb21ba30beb6ceba8f5980cf82e59252332de

Download Submit
memory/828-65-0x0000000003FC1000-0x0000000004E6D000-memory.dmp

Filesize
14.7MB

Download
memory/1444-56-0x0000000076431000-0x0000000076433000-memory.dmp

Filesize
8KB

Download