juko | 0f6003a9c44cc5888fad9faa287b79dad151bc05a074895538d7571e9d23471a

General

Target
2026-05-28_dfd37e8197e24dfe0d557875ea94cf63_elex_wannacry.exe
Size 87KB
Sample260528-kspg2abs4n
SHA256 0f6003a9c44cc5888fad9faa287b79dad151bc05a074895538d7571e9d23471a
MD5 dfd37e8197e24dfe0d557875ea94cf63
SHA1 b3d17d40e4fbc2bc0307ceccd8cd7fca42e41e5d
SHA512 3d004816cdd7672152451d6621e792478421bf0a9536b58d4452714f1d490c7d4f465e55a65776473f246bbd66869319c49d8fed6ee3ce7c17d2d2ef842eeb15
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpt:2Ly2Kerc64CiGIm1K851YO6EQkwpt
TLSH
T18193A1763A259191C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4116-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000c000000028ec9-5.dat	family_juko
behavioral2/memory/4116-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4288-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b5d6-15.dat	family_juko
behavioral2/memory/4560-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4560-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4288	WINWORD.exe
4560	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-1-5-21-1768642833-2142038154-4041560723-1000\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	2026-05-28_dfd37e8197e24dfe0d557875ea94cf63_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
5940	cmd.exe
5392	PING.EXE
4360	PING.EXE
5568	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5392	PING.EXE
4360	PING.EXE
5568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4116 wrote to memory of 4288	4116	2026-05-28_dfd37e8197e24dfe0d557875ea94cf63_elex_wannacry.exe	80
PID 4288 wrote to memory of 5940	4288	WINWORD.exe	81
PID 5940 wrote to memory of 5392	5940	cmd.exe	83
PID 5940 wrote to memory of 4360	5940	cmd.exe	84
PID 5940 wrote to memory of 5568	5940	cmd.exe	85
PID 5940 wrote to memory of 4560	5940	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-28_dfd37e8197e24dfe0d557875ea94cf63_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-28_dfd37e8197e24dfe0d557875ea94cf63_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4116
- 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:4288
- - 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\0000685C" 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:5940
  - - 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:5392
  - - 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:4360
  - - 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:5568
  - - 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:4560

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

Replay Monitor

Loading Replay Monitor...

Downloads

0000685C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000685C
Size 87KB
SHA256 e1e7af8a34d51b949753f3e3135b9f624b5fd71a2e62fc2d4a8aa87fa6a061c3
MD5 fa7fb989d12b52c4025a3cb32023b764
SHA1 874c8160c01160a9fde7248877f2fe9ca4a94f57
SHA512 5afebe6be16b918d6cd7c1803f6b1792bfc5a11d0d0ca2b088be5e8e7cadb90ee8c424c0d3eef763376a7e453e46fed9c310a021e74e61d985c251618e1e29d4
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpR:2Ly2Kerc64CiGIm1K851YO6EQkwpR
TLSH
T1A593A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 0f6003a9c44cc5888fad9faa287b79dad151bc05a074895538d7571e9d23471a
MD5 dfd37e8197e24dfe0d557875ea94cf63
SHA1 b3d17d40e4fbc2bc0307ceccd8cd7fca42e41e5d
SHA512 3d004816cdd7672152451d6621e792478421bf0a9536b58d4452714f1d490c7d4f465e55a65776473f246bbd66869319c49d8fed6ee3ce7c17d2d2ef842eeb15
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpt:2Ly2Kerc64CiGIm1K851YO6EQkwpt
TLSH
T18193A1763A259191C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4116-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4116-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4288-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4560-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4560-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads