juko | de8b8123a8039125c98e896bc7f626424d1e2b727f0e44a65c644927a4b48609

General

Target
2026-07-08_7a6f2b4b49aaf6b91df0824221f5bd6c_elex_wannacry.exe
Size 48KB
Sample260708-2aecsaay6w
SHA256 de8b8123a8039125c98e896bc7f626424d1e2b727f0e44a65c644927a4b48609
MD5 7a6f2b4b49aaf6b91df0824221f5bd6c
SHA1 261a99e588a11947492e6587923d6071dd99483d
SHA512 cbb4f8e2681b0109d7721cce0bb4c75b45f8c071c71a90d2c394ba9cc67c6b6e1a20f85cc03ea72abecc39e8c4510637bf328cb68cebf2b9c2a9b84146338728
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v86:bLy2Kerc64CiGImav42j0S
TLSH
T15B234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/2516-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b0000000241e7-5.dat	family_juko
behavioral1/memory/2516-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3748-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024309-15.dat	family_juko
behavioral1/memory/1432-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1432-18-0x0000000000400000-0x0000000000420000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-07-08_7a6f2b4b49aaf6b91df0824221f5bd6c_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3748	WINWORD.exe
1432	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-1-5-21-889581200-2041691093-2048517887-1000\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	2026-07-08_7a6f2b4b49aaf6b91df0824221f5bd6c_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
1012	PING.EXE
972	PING.EXE
4888	cmd.exe
980	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
980	PING.EXE
1012	PING.EXE
972	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 3748	2516	2026-07-08_7a6f2b4b49aaf6b91df0824221f5bd6c_elex_wannacry.exe	85
PID 3748 wrote to memory of 4888	3748	WINWORD.exe	86
PID 4888 wrote to memory of 980	4888	cmd.exe	88
PID 4888 wrote to memory of 1012	4888	cmd.exe	89
PID 4888 wrote to memory of 972	4888	cmd.exe	96
PID 4888 wrote to memory of 1432	4888	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\2026-07-08_7a6f2b4b49aaf6b91df0824221f5bd6c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-08_7a6f2b4b49aaf6b91df0824221f5bd6c_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2516
- 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:3748
- - 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\00007726" 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:4888
  - - 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:980
  - - 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:1012
  - - 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:972
  - - 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:1432

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

00007726

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007726
Size 48KB
SHA256 42220514a8c084c4fcd246d98b97256d8a06a5377b292b7a63954b6b1e828ff8
MD5 de21f3040066600876763b3d64a91eb1
SHA1 6a8bf6b3aed9e677e3b76680d8ab1d9a3a05a63d
SHA512 239722dc4b3532a7911a4a6a0f3fb0884f95c9cb1fede022f6afd90150164bd485a89b17dd006876a1b55a1da498aa2da63d30281b1bf70dfbe0580b4abe0b5b
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8/:bLy2Kerc64CiGImav42j0H
TLSH
T135234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 de8b8123a8039125c98e896bc7f626424d1e2b727f0e44a65c644927a4b48609
MD5 7a6f2b4b49aaf6b91df0824221f5bd6c
SHA1 261a99e588a11947492e6587923d6071dd99483d
SHA512 cbb4f8e2681b0109d7721cce0bb4c75b45f8c071c71a90d2c394ba9cc67c6b6e1a20f85cc03ea72abecc39e8c4510637bf328cb68cebf2b9c2a9b84146338728
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v86:bLy2Kerc64CiGImav42j0S
TLSH
T15B234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1432-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1432-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2516-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2516-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3748-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads