juko | 860c10e1783c582070c74ca600308e8c2a11b184b6c2b6ce6da1cbdf0e278d27

General

Target
2026-08-21_a78aad703286c26f6de6b9c57c8ab3f6_elex_wannacry.exe
Size 94KB
Sample260821-bz81kstycx
SHA256 860c10e1783c582070c74ca600308e8c2a11b184b6c2b6ce6da1cbdf0e278d27
MD5 a78aad703286c26f6de6b9c57c8ab3f6
SHA1 e3054bb69e3e3cd6859963579f36bf262eb830df
SHA512 e14e2a8bdbbc1a0c2591913660562ac0c0af4255704dea3801d0bfbafafd2ec20e394b57501599394ce7c4270d9b9e685a1a2a85ae7c43ccc8fb2d11278cbdcf
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nn:RLy2Kerc64CiGImFYgUBWTb4/Nn
TLSH
T166937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/3036-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x0007000000006977-5.dat	family_juko
behavioral2/memory/3036-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5192-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b53-13.dat	family_juko
behavioral2/memory/5024-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5024-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5192	WINWORD.exe
5024	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-1-5-21-4046655672-1449839301-2197395821-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4956	cmd.exe

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-21_a78aad703286c26f6de6b9c57c8ab3f6_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

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
2112	PING.EXE
1756	PING.EXE
4432	PING.EXE
4956	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2112	PING.EXE
1756	PING.EXE
4432	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3036 wrote to memory of 5192	3036	2026-08-21_a78aad703286c26f6de6b9c57c8ab3f6_elex_wannacry.exe	89
PID 5192 wrote to memory of 4956	5192	WINWORD.exe	90
PID 4956 wrote to memory of 2112	4956	cmd.exe	92
PID 4956 wrote to memory of 1756	4956	cmd.exe	93
PID 4956 wrote to memory of 4432	4956	cmd.exe	94
PID 4956 wrote to memory of 5024	4956	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-21_a78aad703286c26f6de6b9c57c8ab3f6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-21_a78aad703286c26f6de6b9c57c8ab3f6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3036
- 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:5192
- - 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\00003DB4" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4956
  - - 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:2112
  - - 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:1756
  - - 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:4432
  - - 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:5024

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00003DB4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003DB4
Size 94KB
SHA256 d1b98451c63620431bbee9e471f217b187bd15f1580b733f274f82189c303f80
MD5 47382db38449e246c6f47a103932c3ca
SHA1 9816a9d1a0c16a24070752342295e195b4f43661
SHA512 b57fdcb4fb497a90e296c22a1e681161b4621e303c93c2342def3765abfcb8e93b1ae51cbd8658fac94d7bcee7c1c7da8762c996cd2d7a274153693359b9e95a
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Np:RLy2Kerc64CiGImFYgUBWTb4/Np
TLSH
T15A937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 860c10e1783c582070c74ca600308e8c2a11b184b6c2b6ce6da1cbdf0e278d27
MD5 a78aad703286c26f6de6b9c57c8ab3f6
SHA1 e3054bb69e3e3cd6859963579f36bf262eb830df
SHA512 e14e2a8bdbbc1a0c2591913660562ac0c0af4255704dea3801d0bfbafafd2ec20e394b57501599394ce7c4270d9b9e685a1a2a85ae7c43ccc8fb2d11278cbdcf
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nn:RLy2Kerc64CiGImFYgUBWTb4/Nn
TLSH
T166937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3036-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/3036-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5024-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5024-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5192-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads