juko | 5e6f0e6cdf549c3fb082a6d89539860fca0cdb7e3ea0212e4482bdc76f5ff1db

General

Target
2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe
Size 49KB
Sample260716-dfzznsft3x
SHA256 5e6f0e6cdf549c3fb082a6d89539860fca0cdb7e3ea0212e4482bdc76f5ff1db
MD5 2a1d622f7eccc8e53353bf5ec0c8acbd
SHA1 cad6c38bf88f3f3201a843cc45ad9cc921984dfc
SHA512 70e22e8376d9de0989853719d5fd8ca1eaebf1a5a828f8875e63f45c3f68bcdde2a2f8a57ac2c3a285cad9b4139b98cc4544ebf527c4aaf84bcbfb23aa9326d5
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h22:VLy2Kerc64CiGImVucp4kojWh22
TLSH
T13E334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/1712-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0005000000023208-5.dat	family_juko
behavioral1/memory/1712-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4448-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024546-15.dat	family_juko
behavioral1/memory/4628-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4628-18-0x0000000000400000-0x0000000000420000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4448	WINWORD.exe
4628	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-1-5-21-2937465464-4167303362-2236413517-1000\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	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	2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_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

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
2176	PING.EXE
1172	cmd.exe
3092	PING.EXE
3080	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3092	PING.EXE
3080	PING.EXE
2176	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1712 wrote to memory of 4448	1712	2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe	86
PID 4448 wrote to memory of 1172	4448	WINWORD.exe	89
PID 1172 wrote to memory of 3092	1172	cmd.exe	91
PID 1172 wrote to memory of 3080	1172	cmd.exe	93
PID 1172 wrote to memory of 2176	1172	cmd.exe	94
PID 1172 wrote to memory of 4628	1172	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-16_2a1d622f7eccc8e53353bf5ec0c8acbd_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1712
- 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:4448
- - 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\00002B5F" 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:1172
  - - 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:3092
  - - 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:3080
  - - 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:4628

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

00002B5F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002B5F
Size 49KB
SHA256 f3b1620c916b82eef60d3e3cc50e7594eca42bff97b3e146f29d8f195da8d22f
MD5 3a4effe5568baa9d2ef7170cfe7a29b3
SHA1 6a73a25e3f2caefab05d5811da0588716463fa7b
SHA512 56f81d72eaee9d75d5a3783b8c108abb98862ddfc5955b082f788ff03ae4a6ac8bab5e307130a9ece571321d20be41c9a6e1207256fc4eaef8f1a6c2e76466ef
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2H:VLy2Kerc64CiGImVucp4kojWh2H
TLSH
T112334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5e6f0e6cdf549c3fb082a6d89539860fca0cdb7e3ea0212e4482bdc76f5ff1db
MD5 2a1d622f7eccc8e53353bf5ec0c8acbd
SHA1 cad6c38bf88f3f3201a843cc45ad9cc921984dfc
SHA512 70e22e8376d9de0989853719d5fd8ca1eaebf1a5a828f8875e63f45c3f68bcdde2a2f8a57ac2c3a285cad9b4139b98cc4544ebf527c4aaf84bcbfb23aa9326d5
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h22:VLy2Kerc64CiGImVucp4kojWh22
TLSH
T13E334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1712-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1712-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4448-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4628-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4628-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads