juko | 412fa3a877f00b03a1152030193a866227e560236f8fa89ebbde4d745109ce4b

General

Target
2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe
Size 50KB
Sample260415-rf4jragv9n
SHA256 412fa3a877f00b03a1152030193a866227e560236f8fa89ebbde4d745109ce4b
MD5 39f71136e77c2457aec1556566c46820
SHA1 0ac671a263f3e8aab131bd68fc907316e7dd0955
SHA512 c66241f0f253c7149db3b4df3824168ebd6061e45ba0d24635048102809dd20b6d0c8a027e41486eb3a109aef7f3d97630524688ad6da9209ff74a475550d9e9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOE:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOE
TLSH
T14A33281A3B45E1D1C49361B0EC574F74983AEDB58E276103BB85B70D2CB2A52CF7298E
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
behavioral2/files/0x000b00000002a10a-4.dat	family_juko
behavioral2/files/0x001b00000002b3df-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3064	WINWORD.exe
4260	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-1-5-21-2397528088-2630719772-1129911217-1000\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	2026-04-15_39f71136e77c2457aec1556566c46820_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
5112	PING.EXE
5080	PING.EXE
6080	PING.EXE
5088	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5112	PING.EXE
5080	PING.EXE
6080	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5496 wrote to memory of 3064	5496	2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe	79
PID 3064 wrote to memory of 5088	3064	WINWORD.exe	80
PID 5088 wrote to memory of 5112	5088	cmd.exe	82
PID 5088 wrote to memory of 5080	5088	cmd.exe	83
PID 5088 wrote to memory of 6080	5088	cmd.exe	84
PID 5088 wrote to memory of 4260	5088	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_39f71136e77c2457aec1556566c46820_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5496
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3064
- - 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\00006A46" 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:5088
  - - 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:5112
  - - 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:5080
  - - 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:6080
  - - 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:4260

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00006A46

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006A46
Size 50KB
SHA256 e70679f02e73e43ea2fe375d115b87c07eb01fcb64edf3f318c54b03546bc6ec
MD5 81523598361b7f0c2b4984e59dfaf27e
SHA1 290a68b2209b096f4b014aa69c747c4f79b7e2c3
SHA512 dd8df43df31e6ea8044d0c45b2206661d0e404f9a5d2932c893c5a6b58e923b67ce0725fff230068af91ccea3c2ec14def052fddf50034fc1bf01f6dc9cd5b4a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOG:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOG
TLSH
T11E33281A3B45E1D1C49361B0EC574F74983AECB58E276103BB85B70D2CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 412fa3a877f00b03a1152030193a866227e560236f8fa89ebbde4d745109ce4b
MD5 39f71136e77c2457aec1556566c46820
SHA1 0ac671a263f3e8aab131bd68fc907316e7dd0955
SHA512 c66241f0f253c7149db3b4df3824168ebd6061e45ba0d24635048102809dd20b6d0c8a027e41486eb3a109aef7f3d97630524688ad6da9209ff74a475550d9e9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqzyNPWQHF8Sdq96AaWILOE:tLsF2Kerc64sTiX2IV0Dz5K8SE9nYOE
TLSH
T14A33281A3B45E1D1C49361B0EC574F74983AEDB58E276103BB85B70D2CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3064-13-0x0000000000AD0000-0x0000000000B4A000-memory.dmp

Download

memory/4260-16-0x00000000009A0000-0x0000000000A1A000-memory.dmp

Download

memory/5496-10-0x0000000000970000-0x00000000009EA000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads