juko | 43412023fd7213675d66206ddb694c1de35bb387e25f2f5787d35fd511b3a7e9

General

Target
2026-05-23_33a832d0d7e25ae8488ad83d03b6fe69_elex_wannacry.exe
Size 49KB
Sample260523-s8ddpscs5q
SHA256 43412023fd7213675d66206ddb694c1de35bb387e25f2f5787d35fd511b3a7e9
MD5 33a832d0d7e25ae8488ad83d03b6fe69
SHA1 85cf65a7561df39ab1041cf4f364a0f311c56196
SHA512 644872860f1c230eb145d0082a2c0c5b6aa2f79b9eb0eb4d2aa5e8903831572f1766c6eaa97793150a7b3535b96fb31f106f8e4f9fb59053e9a0ada076b7e4d6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2m:4Ly2Kerc64CiGImVu8p4kojWh2m
TLSH
T173334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3912-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024292-5.dat	family_juko
behavioral1/memory/3912-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4844-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024295-15.dat	family_juko
behavioral1/memory/1596-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1596-18-0x0000000000400000-0x0000000000420000-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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-05-23_33a832d0d7e25ae8488ad83d03b6fe69_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4844	WINWORD.exe
1596	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-1-5-21-876885714-46325919-1482798410-1000\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	2026-05-23_33a832d0d7e25ae8488ad83d03b6fe69_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
5076	cmd.exe
1728	PING.EXE
5456	PING.EXE
1732	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1728	PING.EXE
5456	PING.EXE
1732	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3912 wrote to memory of 4844	3912	2026-05-23_33a832d0d7e25ae8488ad83d03b6fe69_elex_wannacry.exe	90
PID 4844 wrote to memory of 5076	4844	WINWORD.exe	91
PID 5076 wrote to memory of 1728	5076	cmd.exe	93
PID 5076 wrote to memory of 5456	5076	cmd.exe	94
PID 5076 wrote to memory of 1732	5076	cmd.exe	95
PID 5076 wrote to memory of 1596	5076	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-05-23_33a832d0d7e25ae8488ad83d03b6fe69_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-23_33a832d0d7e25ae8488ad83d03b6fe69_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3912
- 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:4844
- - 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\00004F20" 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:5076
  - - 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:1728
  - - 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:5456
  - - 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:1732
  - - 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:1596

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

00004F20

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004F20
Size 49KB
SHA256 6e583a73362ea30a74f60ff475d2af5aeabc4864456aa756eb4c75b539f559e1
MD5 307f567503f7fe7bcbf3a97fed230221
SHA1 2714a30137c6fcae5cdb286a439cfccb59e984a4
SHA512 7adb35bd3848254c8be701943f3777e20787622920c10c228b70d22d4ba8854a96e4e830c68eb8d5b78661bbf873a113c5bdcd4a07781d378d20844a1170b450
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2g:4Ly2Kerc64CiGImVu8p4kojWh2g
TLSH
T10E334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 43412023fd7213675d66206ddb694c1de35bb387e25f2f5787d35fd511b3a7e9
MD5 33a832d0d7e25ae8488ad83d03b6fe69
SHA1 85cf65a7561df39ab1041cf4f364a0f311c56196
SHA512 644872860f1c230eb145d0082a2c0c5b6aa2f79b9eb0eb4d2aa5e8903831572f1766c6eaa97793150a7b3535b96fb31f106f8e4f9fb59053e9a0ada076b7e4d6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2m:4Ly2Kerc64CiGImVu8p4kojWh2m
TLSH
T173334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1596-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1596-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3912-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3912-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4844-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads