juko | 63df60904bb2b4e347581b66160302645223516a0e290069ef733143029e5344

General

Target
2026-06-29_a1f67a4b59335379e4a8c87c1e71374e_elex_wannacry.exe
Size 87KB
Sample260630-gae9vsfv2w
SHA256 63df60904bb2b4e347581b66160302645223516a0e290069ef733143029e5344
MD5 a1f67a4b59335379e4a8c87c1e71374e
SHA1 19fcb4d8458a722424571260fb8b33c712201c15
SHA512 708c64d5bc2c343f48957178c0e72c1da8fc1b01be14933870ce3b8f52c0143f72f40bf595b6c2d2eb67c90c490ab3e7f685da527699a5e1c10dabe0a8de97c8
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp3:2Ly2Kerc64CiGIm1K851YO6EQkwp3
TLSH
T1A893A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/6072-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d000000019cc2-5.dat	family_juko
behavioral2/memory/6072-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4844-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001000000001c52a-13.dat	family_juko
behavioral2/memory/5908-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5908-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4844	WINWORD.exe
5908	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-1-5-21-1086369643-1618123105-2567081378-1000\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	2026-06-29_a1f67a4b59335379e4a8c87c1e71374e_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
2444	PING.EXE
2464	cmd.exe
3956	PING.EXE
2572	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3956	PING.EXE
2572	PING.EXE
2444	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6072 wrote to memory of 4844	6072	2026-06-29_a1f67a4b59335379e4a8c87c1e71374e_elex_wannacry.exe	88
PID 4844 wrote to memory of 2464	4844	WINWORD.exe	89
PID 2464 wrote to memory of 3956	2464	cmd.exe	91
PID 2464 wrote to memory of 2572	2464	cmd.exe	92
PID 2464 wrote to memory of 2444	2464	cmd.exe	93
PID 2464 wrote to memory of 5908	2464	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-06-29_a1f67a4b59335379e4a8c87c1e71374e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-29_a1f67a4b59335379e4a8c87c1e71374e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6072
- 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:4844
- - 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\000017D5" 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:2464
  - - 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:3956
  - - 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:2572
  - - 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:2444
  - - 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:5908

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

000017D5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000017D5
Size 87KB
SHA256 cf771c511da6d783ce4ea54a659ac8cc67239ddec9e22e8572928108e18ae983
MD5 374db654a57b30dde52628b2704de9ad
SHA1 9250415b057acef2cfb98eb8e3a21b73742adf73
SHA512 cda7f5eae7578bac7099d81206ae4b65443b43d9c55693676fd4dd2a6666ca771f1c85d924b67aef5460f76268d1a7d144f7a8441f69c77dd094a31c7e8dcb85
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpK:2Ly2Kerc64CiGIm1K851YO6EQkwpK
TLSH
T1D093A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 63df60904bb2b4e347581b66160302645223516a0e290069ef733143029e5344
MD5 a1f67a4b59335379e4a8c87c1e71374e
SHA1 19fcb4d8458a722424571260fb8b33c712201c15
SHA512 708c64d5bc2c343f48957178c0e72c1da8fc1b01be14933870ce3b8f52c0143f72f40bf595b6c2d2eb67c90c490ab3e7f685da527699a5e1c10dabe0a8de97c8
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp3:2Ly2Kerc64CiGIm1K851YO6EQkwp3
TLSH
T1A893A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4844-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5908-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5908-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6072-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6072-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads