juko | cb58f387b3918c5fdf85023f683c5557dc01dd36b1db16ba8518db1cccc0f9fd

General

Target
2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe
Size 67KB
Sample260808-kvarnatcpd
SHA256 cb58f387b3918c5fdf85023f683c5557dc01dd36b1db16ba8518db1cccc0f9fd
MD5 583ac7cf3b64473df9ae2b996b370299
SHA1 9429b5bd228a0e561ff0cc0794b7dee903f5f56b
SHA512 563927248ae3a99cf1e10b5f6bfd7edf713b19c95b86d5e70505b1a9dfad3cb02c3a437bc1dfa7a453fc2c6f88eed304ff5d377ace8666012d647822a3293959
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ9:aLy2Kerc64CiGImRylFyp8TG
TLSH
T166633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 6 IoCs

resource	yara_rule
behavioral1/memory/4800-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00110000000231f3-5.dat	family_juko
behavioral1/memory/4800-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3472-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00040000000233a4-15.dat	family_juko
behavioral1/memory/4184-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3472	WINWORD.exe
4184	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4188	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4188	cmd.exe
4316	PING.EXE
4936	PING.EXE
2448	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4316	PING.EXE
4936	PING.EXE
2448	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4800 wrote to memory of 3472	4800	2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe	84
PID 3472 wrote to memory of 4188	3472	WINWORD.exe	85
PID 4188 wrote to memory of 4316	4188	cmd.exe	87
PID 4188 wrote to memory of 4936	4188	cmd.exe	89
PID 4188 wrote to memory of 2448	4188	cmd.exe	90
PID 4188 wrote to memory of 4184	4188	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_583ac7cf3b64473df9ae2b996b370299_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4800
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3472
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00006E80" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4188
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4316
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4936
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2448
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:4184

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00006E80

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006E80
Size 67KB
SHA256 d2ccbfcc3c2ecc7f46d5df4f4179815c75ef977d2fbdcb023a3ac01bb2fc89b0
MD5 fd47539942fda5788a756a3ef99e71ce
SHA1 c8205fd1ac4445079dce87bdb124ac409f586243
SHA512 45ca1de690cce13f82257dcd170288649b02a3b1b2e3277a08cdd4db8f3bbec60b3e510809fa73d80cddd2bccb6726e0cf69a933f12d32044f05087e4b031c3b
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQl:aLy2Kerc64CiGImRylFyp8Ta
TLSH
T12E633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 cb58f387b3918c5fdf85023f683c5557dc01dd36b1db16ba8518db1cccc0f9fd
MD5 583ac7cf3b64473df9ae2b996b370299
SHA1 9429b5bd228a0e561ff0cc0794b7dee903f5f56b
SHA512 563927248ae3a99cf1e10b5f6bfd7edf713b19c95b86d5e70505b1a9dfad3cb02c3a437bc1dfa7a453fc2c6f88eed304ff5d377ace8666012d647822a3293959
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQ9:aLy2Kerc64CiGImRylFyp8TG
TLSH
T166633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3472-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4184-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4800-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4800-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads