juko | a6ff9f2590a4d7794a88d53fdf929c70a40c1da1c673d276284573f5900cc3aa

General

Target
2026-07-04_5d5f3618db9f01fd444349b2e09b88da_elex_wannacry.exe
Size 49KB
Sample260704-1vdrbaev8w
SHA256 a6ff9f2590a4d7794a88d53fdf929c70a40c1da1c673d276284573f5900cc3aa
MD5 5d5f3618db9f01fd444349b2e09b88da
SHA1 f779de95fbfdddb759d102a7dd09a9e9dfcb2a23
SHA512 d16fc8c403e44a1577dfecb68291d9f479f7cec68a55d112dfe3ec95f2176814393676ef2c4cf86a2ceee4fb02ca2ae9c8f2d01a96001d3a4eca4a4820d91b39
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2/:VLy2Kerc64CiGImVucp4kojWh2/
TLSH
T1E9334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
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/2540-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000000836-5.dat	family_juko
behavioral2/memory/2540-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1492-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00060000000187cb-13.dat	family_juko
behavioral2/memory/5920-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5920-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1492	WINWORD.exe
5920	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-1-5-21-1797646245-3139070211-3019596475-1000\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	2026-07-04_5d5f3618db9f01fd444349b2e09b88da_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
3560	cmd.exe
2476	PING.EXE
4684	PING.EXE
2176	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2476	PING.EXE
4684	PING.EXE
2176	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2540 wrote to memory of 1492	2540	2026-07-04_5d5f3618db9f01fd444349b2e09b88da_elex_wannacry.exe	87
PID 1492 wrote to memory of 3560	1492	WINWORD.exe	88
PID 3560 wrote to memory of 2476	3560	cmd.exe	90
PID 3560 wrote to memory of 4684	3560	cmd.exe	91
PID 3560 wrote to memory of 2176	3560	cmd.exe	92
PID 3560 wrote to memory of 5920	3560	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-04_5d5f3618db9f01fd444349b2e09b88da_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_5d5f3618db9f01fd444349b2e09b88da_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2540
- 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:1492
- - 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\0000518E" 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:3560
  - - 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:2476
  - - 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:4684
  - - 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:2176
  - - 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:5920

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5936

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

0000518E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000518E
Size 49KB
SHA256 ed83c4348fc2487af126522734a066fe4adda53b319251a98b9a52dc723a34f7
MD5 ce22ed058b9a84e9bdf31ba087a47294
SHA1 c877235a42ad798d600602840bf89982e95b10ae
SHA512 17edc6925c78e2179da021ba2d0160abe6fe33056949cb77f3dbaff28d966b6e41755d27bdc16bf71f063986a1fb608b647cbcff553a52f8edfaa879d371d349
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2k:VLy2Kerc64CiGImVucp4kojWh2k
TLSH
T146334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 a6ff9f2590a4d7794a88d53fdf929c70a40c1da1c673d276284573f5900cc3aa
MD5 5d5f3618db9f01fd444349b2e09b88da
SHA1 f779de95fbfdddb759d102a7dd09a9e9dfcb2a23
SHA512 d16fc8c403e44a1577dfecb68291d9f479f7cec68a55d112dfe3ec95f2176814393676ef2c4cf86a2ceee4fb02ca2ae9c8f2d01a96001d3a4eca4a4820d91b39
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2/:VLy2Kerc64CiGImVucp4kojWh2/
TLSH
T1E9334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1492-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2540-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2540-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5920-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5920-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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