juko | f2731c640d1412498931b0632e3b056490796dc9b9c3f5ca582943ee42185d8b

General

Target
2026-05-27_9e9f6a88866866c9a713af3553339b87_elex_wannacry.exe
Size 49KB
Sample260527-e8b9rafs4k
SHA256 f2731c640d1412498931b0632e3b056490796dc9b9c3f5ca582943ee42185d8b
MD5 9e9f6a88866866c9a713af3553339b87
SHA1 c6f56e912b2fb24207f143bc3fc90e21b59183a7
SHA512 881bb166414d480df30b84af5a2d58d8e9fd348136d37bb2d2edcc6b27b73fefc6b1ca5c8f07e1a4c0433df4fad26cccbe5128d9562f965846c5deb021ba739a
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2b:4Ly2Kerc64CiGImVu8p4kojWh2b
TLSH
T172334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

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

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/492-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000a000000025021-5.dat	family_juko
behavioral2/memory/492-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3764-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000500000002a77a-15.dat	family_juko
behavioral2/memory/3252-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3252-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3764	WINWORD.exe
3252	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-1-5-21-1768642833-2142038154-4041560723-1000\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

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	2026-05-27_9e9f6a88866866c9a713af3553339b87_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4852	cmd.exe
444	PING.EXE
960	PING.EXE
2512	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
444	PING.EXE
960	PING.EXE
2512	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 492 wrote to memory of 3764	492	2026-05-27_9e9f6a88866866c9a713af3553339b87_elex_wannacry.exe	79
PID 3764 wrote to memory of 4852	3764	WINWORD.exe	80
PID 4852 wrote to memory of 444	4852	cmd.exe	82
PID 4852 wrote to memory of 960	4852	cmd.exe	83
PID 4852 wrote to memory of 2512	4852	cmd.exe	84
PID 4852 wrote to memory of 3252	4852	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-27_9e9f6a88866866c9a713af3553339b87_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_9e9f6a88866866c9a713af3553339b87_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:492
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3764
- - 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\00003113" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4852
  - - 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:444
  - - 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:960
  - - 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:2512
  - - 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:3252

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00003113

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003113
Size 49KB
SHA256 b9f993b585b14e01e9c800d530aaa159a4ebdcbcab93262f958046430d63a0dd
MD5 aa239834c99dd619fec306904083fa5f
SHA1 caa543907aeb2ad31bec5ae21660cc385e15b00d
SHA512 e6b666766b18ed127638c29b82c6acb43feab95e93d983a3f351c0c022e2efc69434bf6f624c3482080d80190db0e240a5cb1de65adb9fda459d9390a3526169
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2u:4Ly2Kerc64CiGImVu8p4kojWh2u
TLSH
T1B5334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 f2731c640d1412498931b0632e3b056490796dc9b9c3f5ca582943ee42185d8b
MD5 9e9f6a88866866c9a713af3553339b87
SHA1 c6f56e912b2fb24207f143bc3fc90e21b59183a7
SHA512 881bb166414d480df30b84af5a2d58d8e9fd348136d37bb2d2edcc6b27b73fefc6b1ca5c8f07e1a4c0433df4fad26cccbe5128d9562f965846c5deb021ba739a
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2b:4Ly2Kerc64CiGImVu8p4kojWh2b
TLSH
T172334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/492-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/492-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3252-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3252-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3764-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads