juko | a61b4059f0c4007e5db981aac66f687544c5dcf7f22fe990e637feec08e9e9fb

General

Target
2026-07-02_855b7a151ef9f6cada84219f53466fac_elex_wannacry.exe
Size 49KB
Sample260702-2mcdysfz3v
SHA256 a61b4059f0c4007e5db981aac66f687544c5dcf7f22fe990e637feec08e9e9fb
MD5 855b7a151ef9f6cada84219f53466fac
SHA1 dba19ae1ed6eb1e3319771e3fe75383119676b8e
SHA512 6f342b3c9af7ac88eedbc2145eff43c66ef4d119254119915b70710f1790f1b67997e157de474c35f34f0425bfd2083602365bf79758907a1209a21325132a6a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T19F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 7 IoCs

resource	yara_rule
behavioral2/memory/6032-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0017000000011900-5.dat	family_juko
behavioral2/memory/6032-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1280-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c683-13.dat	family_juko
behavioral2/memory/3664-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3664-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1280	WINWORD.exe
3664	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-1-5-21-759331733-200834466-1207319849-1000\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	2026-07-02_855b7a151ef9f6cada84219f53466fac_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
2844	PING.EXE
4564	PING.EXE
4408	PING.EXE
5116	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2844	PING.EXE
4564	PING.EXE
4408	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6032 wrote to memory of 1280	6032	2026-07-02_855b7a151ef9f6cada84219f53466fac_elex_wannacry.exe	89
PID 1280 wrote to memory of 5116	1280	WINWORD.exe	90
PID 5116 wrote to memory of 2844	5116	cmd.exe	92
PID 5116 wrote to memory of 4564	5116	cmd.exe	93
PID 5116 wrote to memory of 4408	5116	cmd.exe	94
PID 5116 wrote to memory of 3664	5116	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-02_855b7a151ef9f6cada84219f53466fac_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-02_855b7a151ef9f6cada84219f53466fac_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6032
- 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:1280
- - 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\00003A47" 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:5116
  - - 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:2844
  - - 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:4564
  - - 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:4408
  - - 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:3664

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

00003A47

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003A47
Size 49KB
SHA256 f2943e59efebd09015be7fd6b99715408ed9da5c7250e15946e87ffd7ce065ad
MD5 d745b90d19724356ade8cf608cce1760
SHA1 5ed1983fb043e2d6ea47fffda30e8cc5776c1e18
SHA512 656f6f3bb5c13d4793df21fbc795d253b4468da7d8f5acf3ee725bc517b068180b9b1911e56205e8e2a8121da603c6d5ae5ec648055069b19fea10e157b62fdf
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h28:VLy2Kerc64CiGImVucp4kojWh28
TLSH
T195334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 a61b4059f0c4007e5db981aac66f687544c5dcf7f22fe990e637feec08e9e9fb
MD5 855b7a151ef9f6cada84219f53466fac
SHA1 dba19ae1ed6eb1e3319771e3fe75383119676b8e
SHA512 6f342b3c9af7ac88eedbc2145eff43c66ef4d119254119915b70710f1790f1b67997e157de474c35f34f0425bfd2083602365bf79758907a1209a21325132a6a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2l:VLy2Kerc64CiGImVucp4kojWh2l
TLSH
T19F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1280-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3664-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3664-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6032-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/6032-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads