juko | dffe83474386bc8499bc9ef783c7d23d91daf010c8ff53534fe92b507b979542

General

Target
2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.exe
Size 153KB
Sample260705-tkrf4adx4x
SHA256 dffe83474386bc8499bc9ef783c7d23d91daf010c8ff53534fe92b507b979542
MD5 6bf33e3417d6a3a1facdefa6c4a86a09
SHA1 3478ed00a08172b1d345933fb61255ed32a442da
SHA512 e783688cecb3219b05a06d83e33accd8aecd00358be4a95d4d3aef4d37dc8d4460f6f85e8fe3ee40b471891b367193f573adff4c201f1d1dbc765369d8e9be95
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gy:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZE
TLSH
T18DE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/3224-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x00120000000113b8-5.dat	family_juko
behavioral2/memory/3224-10-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/760-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c643-13.dat	family_juko
behavioral2/memory/5644-15-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral2/memory/5644-16-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
760	WINWORD.exe
5644	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-1-5-21-2581000985-3042091657-4068028891-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.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
5836	cmd.exe
5856	PING.EXE
5652	PING.EXE
5864	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5856	PING.EXE
5652	PING.EXE
5864	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3224 wrote to memory of 760	3224	2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.exe	89
PID 760 wrote to memory of 5836	760	WINWORD.exe	90
PID 5836 wrote to memory of 5856	5836	cmd.exe	92
PID 5836 wrote to memory of 5652	5836	cmd.exe	93
PID 5836 wrote to memory of 5864	5836	cmd.exe	94
PID 5836 wrote to memory of 5644	5836	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3224
- 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:760
- - 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\000061C7" 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:5836
  - - 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:5856
  - - 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:5652
  - - 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:5864
  - - 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:5644

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

000061C7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000061C7
Size 153KB
SHA256 a480b94c8d347706050ef79e10f2278cc2013657f2d0a3d7aab5db25962e63d5
MD5 29c20e99729b082c8155968c7b25f728
SHA1 48c30d9d04b5d054c90a46e8f68295850aeb4f59
SHA512 8d0085978d6415a087ed666613ba7b23d516e6e9b2373c72acac38c3fbf5add9c03c2bb2106d73400bfe4465cfe30d4e7083eea6fc44c9bbf54baf97002e101f
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gY:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZe
TLSH
T1E1E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 153KB
SHA256 dffe83474386bc8499bc9ef783c7d23d91daf010c8ff53534fe92b507b979542
MD5 6bf33e3417d6a3a1facdefa6c4a86a09
SHA1 3478ed00a08172b1d345933fb61255ed32a442da
SHA512 e783688cecb3219b05a06d83e33accd8aecd00358be4a95d4d3aef4d37dc8d4460f6f85e8fe3ee40b471891b367193f573adff4c201f1d1dbc765369d8e9be95
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2gy:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZE
TLSH
T18DE35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/760-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3224-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/3224-10-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/5644-15-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/5644-16-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads