juko | 2cca178952faed91af1ca285e432c0d2201a47d8ab3f54def20e5165ef440770

General

Target
2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe
Size 49KB
Sample260730-ls8fksfc78
SHA256 2cca178952faed91af1ca285e432c0d2201a47d8ab3f54def20e5165ef440770
MD5 c23031ab0616933df4c460280a28e722
SHA1 a40121408e66aec65ad176a97df2f9171c496648
SHA512 45da33b269d31e140308e0cbf1028faf672f61d1c31943dbc5c86f297796f05df514547e82042bd3d6d38a1af310756d527d45022a35c36e7555ac969edd1217
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h20:VLy2Kerc64CiGImVucp4kojWh20
TLSH
T1A2334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4516-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x001000000002445c-5.dat	family_juko
behavioral1/memory/4516-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3568-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024679-15.dat	family_juko
behavioral1/memory/4776-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4776-18-0x0000000000400000-0x0000000000420000-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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3568	WINWORD.exe
4776	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-1-5-21-2370214745-1838013427-2987045292-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2936	cmd.exe

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	2026-07-30_c23031ab0616933df4c460280a28e722_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
2936	cmd.exe
1032	PING.EXE
3208	PING.EXE
2756	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1032	PING.EXE
3208	PING.EXE
2756	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4516 wrote to memory of 3568	4516	2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe	85
PID 3568 wrote to memory of 2936	3568	WINWORD.exe	86
PID 2936 wrote to memory of 1032	2936	cmd.exe	88
PID 2936 wrote to memory of 3208	2936	cmd.exe	89
PID 2936 wrote to memory of 2756	2936	cmd.exe	90
PID 2936 wrote to memory of 4776	2936	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_c23031ab0616933df4c460280a28e722_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4516
- 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:3568
- - 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\00005840" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2936
  - - 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:1032
  - - 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:3208
  - - 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:2756
  - - 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:4776

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00005840

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005840
Size 49KB
SHA256 499359c2056445d36258b8427bc6eb33b83cfbfc537c3ddffc4b981b601e9656
MD5 64f5ac199e8720501c4c19cb16432c43
SHA1 1fc00c8fa45098016550b29f54a685300f00ff07
SHA512 e414cf53600c541364926f09ae27e9fd9e654510367260b70de6a3e5afaf166ee2754f1bb0b1415f28be33909a855297e3d97d273b26316e771bbb81bd113312
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Q:VLy2Kerc64CiGImVucp4kojWh2Q
TLSH
T140334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 2cca178952faed91af1ca285e432c0d2201a47d8ab3f54def20e5165ef440770
MD5 c23031ab0616933df4c460280a28e722
SHA1 a40121408e66aec65ad176a97df2f9171c496648
SHA512 45da33b269d31e140308e0cbf1028faf672f61d1c31943dbc5c86f297796f05df514547e82042bd3d6d38a1af310756d527d45022a35c36e7555ac969edd1217
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h20:VLy2Kerc64CiGImVucp4kojWh20
TLSH
T1A2334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3568-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4516-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4516-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4776-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4776-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads