juko | e512c6a26f90092392b5d1d6926723f4ee06a094c4093c76d74872129848edb7

General

Target
2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe
Size 100KB
Sample260425-jdpntaa17x
SHA256 e512c6a26f90092392b5d1d6926723f4ee06a094c4093c76d74872129848edb7
MD5 dc661b5aa06072e0b936cae93a38cea7
SHA1 2b79b5ca80d6a93a8982704cf75f5bef016a4607
SHA512 48b2ffa60f2b1b199aaa957a827c30ef1405a2d6da8ac00844834313d833de4c99137d72a5b113c7904191f7628d1ab3010ff1fc7060ae74139c133502fb96d3
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJt:FLy2Kerc64CiGImavYBoHRBcsAUt
TLSH
T1D1A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000c0000000243e7-4.dat	family_juko
behavioral1/files/0x00090000000243ed-14.dat	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-1-5-21-1609746302-1884177235-1125644204-1000\Control Panel\International\Geo\Nation	2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1609746302-1884177235-1125644204-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5712	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-1-5-21-1609746302-1884177235-1125644204-1000\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	2026-04-25_dc661b5aa06072e0b936cae93a38cea7_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
5196	cmd.exe
1624	PING.EXE
2436	PING.EXE
4208	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1624	PING.EXE
2436	PING.EXE
4208	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4268 wrote to memory of 5712	4268	2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe	85
PID 5712 wrote to memory of 5196	5712	WINWORD.exe	86
PID 5196 wrote to memory of 1624	5196	cmd.exe	88
PID 5196 wrote to memory of 2436	5196	cmd.exe	89
PID 5196 wrote to memory of 4208	5196	cmd.exe	92
PID 5196 wrote to memory of 4628	5196	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4268
- 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:5712
- - 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\00007041" 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:5196
  - - 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:1624
  - - 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:2436
  - - 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:4208
  - - 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

00007041

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007041
Size 100KB
SHA256 8bfdd3beae92de2a6900106a9fb31fdca79947e97cb6c090dad3181e2c777719
MD5 b150b41174e11ed95b8b3e747db686bf
SHA1 e0a83f8cc0f393ef5d4fd3cffcecb9f9fb00a0fc
SHA512 37206ccf8ae74431d1f62655571012978a20496ef473269823a3b6234c6f4824978cce6336338bb014f1bb7c1c8adbd84d5f879ac6f25b3f530d0f250ec07363
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJY:FLy2Kerc64CiGImavYBoHRBcsAUY
TLSH
T14CA3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 100KB
SHA256 e512c6a26f90092392b5d1d6926723f4ee06a094c4093c76d74872129848edb7
MD5 dc661b5aa06072e0b936cae93a38cea7
SHA1 2b79b5ca80d6a93a8982704cf75f5bef016a4607
SHA512 48b2ffa60f2b1b199aaa957a827c30ef1405a2d6da8ac00844834313d833de4c99137d72a5b113c7904191f7628d1ab3010ff1fc7060ae74139c133502fb96d3
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJt:FLy2Kerc64CiGImavYBoHRBcsAUt
TLSH
T1D1A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4268-10-0x0000000002650000-0x000000000268B000-memory.dmp

Download

memory/5712-13-0x0000000002770000-0x00000000027AB000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads