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
behavioral1/memory/2444-0-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/files/0x00070000000231d3-5.dat	family_juko
behavioral1/memory/2444-12-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/memory/2124-14-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/files/0x0008000000024435-15.dat	family_juko
behavioral1/memory/1904-17-0x0000000000400000-0x000000000043B000-memory.dmp	family_juko
behavioral1/memory/1904-18-0x0000000000400000-0x000000000043B000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2124	WINWORD.exe
1904	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-1-5-21-1074038928-2032447174-945360078-1000\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	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
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

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
5112	cmd.exe
4900	PING.EXE
2580	PING.EXE
3544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4900	PING.EXE
2580	PING.EXE
3544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2444 wrote to memory of 2124	2444	2026-07-05_6bf33e3417d6a3a1facdefa6c4a86a09_elex_wannacry.exe	85
PID 2124 wrote to memory of 5112	2124	WINWORD.exe	86
PID 5112 wrote to memory of 4900	5112	cmd.exe	88
PID 5112 wrote to memory of 2580	5112	cmd.exe	89
PID 5112 wrote to memory of 3544	5112	cmd.exe	90
PID 5112 wrote to memory of 1904	5112	cmd.exe	91

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2444
- 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:2124
- - 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\00001E40" 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:5112
  - - 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:4900
  - - 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:2580
  - - 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:3544
  - - 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:1904

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

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

00001E40

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001E40
Size 153KB
SHA256 ae008e547c3cd7ce272fd8b1edd8012d53cfe7aec87846441eece1f7e1450374
MD5 682faedd6d556acf9d4cf290140b891d
SHA1 be6ca6ad68189eadc8f6c511f4b5721d086e6cfe
SHA512 cca7ee6a4cb775d5b8deb15fea63808267bd7c404794d2d9ada010a60f90b3e18dca6a5c1a7ecd8514d5ca99ed1243afbf4c56b7df56e36b0a0b3197741f5e4c
SSDEEP 3072:3Ly2Kerc64CiGImpvxPloaK6Or1kz36Rq4QqjYCr6KNe2aKd/EAGzYMzhq1/Z2g8:3Ly2Kwc64YIspdmrNPyEe2Xd/EPYQmZq
TLSH
T1E8E35C06A14350F6CC2740B056D96BFF8A31BE3544219EEAE798FC69EE73891672D306
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/1904-17-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/1904-18-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/2124-14-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/2444-0-0x0000000000400000-0x000000000043B000-memory.dmp

Download

memory/2444-12-0x0000000000400000-0x000000000043B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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