juko | f33f2439e38892f435d43896b027d675a374590663c84cf4006035c1483d51ca

General

Target
2026-04-25_74b7ad65fb66be953bd286d21776c8d8_elex_wannacry.exe
Size 42KB
Sample260425-ccmphabx2t
SHA256 f33f2439e38892f435d43896b027d675a374590663c84cf4006035c1483d51ca
MD5 74b7ad65fb66be953bd286d21776c8d8
SHA1 a171b030c980cac663ba7bab793ba35db6abb104
SHA512 848fcaf1ef17862d9526b31c9ef4e741ee950174bae73aa996bcd792365743f71f2a02f660ebcaef0ea82ebb5d378db56f7b1a22ad7bc649b53afa7c065aa5a8
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41g:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+f
TLSH
T1AA13171776A460D2CDB76074E91A5E30437E9CF664A7B317A72076202DB3D5ACFA02CE
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/0x0009000000024568-4.dat	family_juko
behavioral1/files/0x0008000000024569-14.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-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	2026-04-25_74b7ad65fb66be953bd286d21776c8d8_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-312252282-3884318443-358092420-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1460	WINWORD.exe
5068	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-1-5-21-312252282-3884318443-358092420-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-25_74b7ad65fb66be953bd286d21776c8d8_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

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
4352	PING.EXE
4680	PING.EXE
3412	cmd.exe
3952	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4352	PING.EXE
4680	PING.EXE
3952	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4300 wrote to memory of 1460	4300	2026-04-25_74b7ad65fb66be953bd286d21776c8d8_elex_wannacry.exe	85
PID 1460 wrote to memory of 3412	1460	WINWORD.exe	86
PID 3412 wrote to memory of 3952	3412	cmd.exe	88
PID 3412 wrote to memory of 4352	3412	cmd.exe	89
PID 3412 wrote to memory of 4680	3412	cmd.exe	90
PID 3412 wrote to memory of 5068	3412	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-04-25_74b7ad65fb66be953bd286d21776c8d8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_74b7ad65fb66be953bd286d21776c8d8_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4300
- 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:1460
- - 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\00002B01" 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:3412
  - - 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:3952
  - - 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:4352
  - - 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:\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:5068

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

00002B01

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002B01
Size 42KB
SHA256 17e7690e3d714a03c97543b6ee6a646c3cb665e52454a35d2bb418788c7e50d8
MD5 606e466b7b75062f474bac4680fd77a2
SHA1 947c56ffc76e587ee9da6ce956bb34276046337e
SHA512 c01f4ce61491aed092f2566911a5e1d23b4faa86227d9a4aecf9093d9fa0d13404ebd0498b553297701e4f6998d02cb8e8681ea46d863ce22527e175e5009ab1
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41r:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+c
TLSH
T18D13171776A460D2CDB76074E91A4E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 f33f2439e38892f435d43896b027d675a374590663c84cf4006035c1483d51ca
MD5 74b7ad65fb66be953bd286d21776c8d8
SHA1 a171b030c980cac663ba7bab793ba35db6abb104
SHA512 848fcaf1ef17862d9526b31c9ef4e741ee950174bae73aa996bcd792365743f71f2a02f660ebcaef0ea82ebb5d378db56f7b1a22ad7bc649b53afa7c065aa5a8
SSDEEP 768:zNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqPNPWQHXFMcnrfrqx4RgutbGHix8f41g:z/LsF2Kerc64sTiX2IV0DgsfrfWJF2+f
TLSH
T1AA13171776A460D2CDB76074E91A5E30437E9CF664A7B317A72076202DB3D5ACFA02CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1460-13-0x0000000001F70000-0x0000000001FEE000-memory.dmp

Download

memory/4300-10-0x0000000002030000-0x00000000020AE000-memory.dmp

Download

memory/5068-16-0x0000000002910000-0x000000000298E000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads