juko | 72e4fc96485e8ade21a249f68202539953a3f5098ca4baba71763f924c2b74ec

General

Target
2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe
Size 30KB
Sample260420-p14zxaay3j
SHA256 72e4fc96485e8ade21a249f68202539953a3f5098ca4baba71763f924c2b74ec
MD5 521b055237432e04dfa48ac0fdaffbc7
SHA1 c26b9eb6abbb3c61b9dd8c9deb90955745d3de1f
SHA512 42ba6781cf89122ab089d0ee7391ce352901210a54e2189e7ab7c8362e98eadd8f22f7e7fa894c4ff0066b49257d6aea3043321cf6c4561332f468f865948394
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXi:tLsF2Kerc64sTiX2IV0Dzloi
TLSH
T1A1E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x001800000001e54c-4.dat	family_juko
behavioral1/files/0x0003000000023149-11.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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5488	WINWORD.exe
3980	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-04-20_521b055237432e04dfa48ac0fdaffbc7_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
2496	PING.EXE
3788	cmd.exe
4092	PING.EXE
4680	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4680	PING.EXE
2496	PING.EXE
4092	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3772 wrote to memory of 5488	3772	2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe	86
PID 5488 wrote to memory of 3788	5488	WINWORD.exe	87
PID 3788 wrote to memory of 4092	3788	cmd.exe	89
PID 3788 wrote to memory of 4680	3788	cmd.exe	90
PID 3788 wrote to memory of 2496	3788	cmd.exe	92
PID 3788 wrote to memory of 3980	3788	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-20_521b055237432e04dfa48ac0fdaffbc7_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3772
- 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:5488
- - 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\00007C9A" 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:3788
  - - 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:4092
  - - 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:4680
  - - 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:2496
  - - 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:3980

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

00007C9A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007C9A
Size 30KB
SHA256 eeff08bbe38c8c16ae780d27148da20a3d833c22ff8f451473d7206e77b995de
MD5 9fba2eac67010988279523472105a905
SHA1 1fbf76069a259fe5768d60102cfabb5cad95d0ae
SHA512 5499eaf97ed77473ceed7416bed85e81f812fb199685fd9f05fa29f4841687fa1ec7e5ccfad04fb50bede1345caa03dcb484d50aa8eb0e90eab2a9747880c54a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXC:tLsF2Kerc64sTiX2IV0DzloC
TLSH
T176E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 72e4fc96485e8ade21a249f68202539953a3f5098ca4baba71763f924c2b74ec
MD5 521b055237432e04dfa48ac0fdaffbc7
SHA1 c26b9eb6abbb3c61b9dd8c9deb90955745d3de1f
SHA512 42ba6781cf89122ab089d0ee7391ce352901210a54e2189e7ab7c8362e98eadd8f22f7e7fa894c4ff0066b49257d6aea3043321cf6c4561332f468f865948394
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXi:tLsF2Kerc64sTiX2IV0Dzloi
TLSH
T1A1E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3772-7-0x0000000000640000-0x00000000006B5000-memory.dmp

Download

memory/3980-13-0x0000000000570000-0x00000000005E5000-memory.dmp

Download

memory/5488-10-0x0000000000420000-0x0000000000495000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads