juko | 48b415e346c543158d3f4bca31fae5e8f1147ccae63d7f4a3aa26aa6e0b3c12b

General

Target
2026-07-01_d6491e15e7c37955af6d4d7fac9c27d8_elex_wannacry.exe
Size 48KB
Sample260701-nlntpscw5r
SHA256 48b415e346c543158d3f4bca31fae5e8f1147ccae63d7f4a3aa26aa6e0b3c12b
MD5 d6491e15e7c37955af6d4d7fac9c27d8
SHA1 3ce45830909c1f6a39ab8f394d9e8ff7a6f98d37
SHA512 60a7bdb8a88c9ebd225d4a80e78abf26ce8264abfdedda5db4420789c4c87d0bc143e75d276f04a739ba44f1b421046d72b14d1c595b7818bc14f809c1be19b7
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v86:bLy2Kerc64CiGImav42j0y
TLSH
T1B6234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/2408-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000d0000000242e6-5.dat	family_juko
behavioral1/memory/2408-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1912-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000245e8-15.dat	family_juko
behavioral1/memory/5056-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5056-18-0x0000000000400000-0x0000000000420000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-07-01_d6491e15e7c37955af6d4d7fac9c27d8_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1912	WINWORD.exe
5056	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-1-5-21-668679576-120646659-2289335452-1000\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	2026-07-01_d6491e15e7c37955af6d4d7fac9c27d8_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
4912	cmd.exe
2316	PING.EXE
2188	PING.EXE
1916	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2316	PING.EXE
2188	PING.EXE
1916	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2408 wrote to memory of 1912	2408	2026-07-01_d6491e15e7c37955af6d4d7fac9c27d8_elex_wannacry.exe	87
PID 1912 wrote to memory of 4912	1912	WINWORD.exe	88
PID 4912 wrote to memory of 2316	4912	cmd.exe	90
PID 4912 wrote to memory of 2188	4912	cmd.exe	91
PID 4912 wrote to memory of 1916	4912	cmd.exe	92
PID 4912 wrote to memory of 5056	4912	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-01_d6491e15e7c37955af6d4d7fac9c27d8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_d6491e15e7c37955af6d4d7fac9c27d8_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2408
- 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:1912
- - 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\00006B8C" 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:4912
  - - 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:2316
  - - 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:2188
  - - 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:1916
  - - 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:5056

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

00006B8C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006B8C
Size 48KB
SHA256 c25310851500b1e3d0354e6c2245dc3f57a9b7d12d9a25a0b213d4894d5f3eab
MD5 610434fc300cb2f4202e217a5668a4ef
SHA1 c6b67ddce51e5f6441821305faf771244657ec62
SHA512 e948b4e8b3f64d9735d6ba0d5d73c7025191d650223a222a0e69e883568175efa00fbd0d13b141c538f526e00a320ad485dcc1db062bb25ce368d0e1377a618b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v86:bLy2Kerc64CiGImav42j0S
TLSH
T121234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 48b415e346c543158d3f4bca31fae5e8f1147ccae63d7f4a3aa26aa6e0b3c12b
MD5 d6491e15e7c37955af6d4d7fac9c27d8
SHA1 3ce45830909c1f6a39ab8f394d9e8ff7a6f98d37
SHA512 60a7bdb8a88c9ebd225d4a80e78abf26ce8264abfdedda5db4420789c4c87d0bc143e75d276f04a739ba44f1b421046d72b14d1c595b7818bc14f809c1be19b7
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v86:bLy2Kerc64CiGImav42j0y
TLSH
T1B6234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1912-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2408-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2408-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5056-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5056-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads