juko | 16e7f177d73d50b58588401b80c45d1534ad5fb82829e680e0c3e6abd8aff9cf

General

Target
2026-07-05_fa63ebfffce7c16ca30745ad129bcc29_elex_wannacry.exe
Size 68KB
Sample260705-gqlftady5r
SHA256 16e7f177d73d50b58588401b80c45d1534ad5fb82829e680e0c3e6abd8aff9cf
MD5 fa63ebfffce7c16ca30745ad129bcc29
SHA1 cbe0298670b24cfe9e6cd465789af88a90836009
SHA512 9bc17f66192f02c2e3417f0dc92ed4e0729cf9c401612d7b721acb5ca83b15f41378410bb169f2794fe738b5563c0d5f3ecc07228e092131a79740e78f52b554
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpo:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpo
TLSH
T17663A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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 8 IoCs

resource	yara_rule
behavioral2/memory/2792-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000800000001b852-5.dat	family_juko
behavioral2/memory/2164-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2792-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2164-13-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c569-14.dat	family_juko
behavioral2/memory/4688-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4688-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2164	WINWORD.exe
4688	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-1-5-21-3704578903-1610922810-1098216751-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-05_fa63ebfffce7c16ca30745ad129bcc29_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
1004	cmd.exe
5700	PING.EXE
3972	PING.EXE
1728	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5700	PING.EXE
3972	PING.EXE
1728	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2792 wrote to memory of 2164	2792	2026-07-05_fa63ebfffce7c16ca30745ad129bcc29_elex_wannacry.exe	88
PID 2164 wrote to memory of 1004	2164	WINWORD.exe	89
PID 1004 wrote to memory of 5700	1004	cmd.exe	91
PID 1004 wrote to memory of 3972	1004	cmd.exe	92
PID 1004 wrote to memory of 1728	1004	cmd.exe	93
PID 1004 wrote to memory of 4688	1004	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-05_fa63ebfffce7c16ca30745ad129bcc29_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-05_fa63ebfffce7c16ca30745ad129bcc29_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2792
- 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:2164
- - 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\0000127E" 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:1004
  - - 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:5700
  - - 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:3972
  - - 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:1728
  - - 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:4688

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

0000127E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000127E
Size 68KB
SHA256 434a2578662024f675f37c1927a5ca0e7da5cfba70a95a4d410aabe0545d6c0b
MD5 0055417e5505c84546b65ada089f96a3
SHA1 4398af412245f94d09ce35c64a097b7653a0f4b3
SHA512 ce3fa04d8c7381baf6046740a13470378c18fe68775c8fd755e1536ddbdc5e40e2a80a28dfcb29db5cdc2fca0f5ddda5ff37ba122a1d78aab92cf7594c686af9
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpa:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpa
TLSH
T15663A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 16e7f177d73d50b58588401b80c45d1534ad5fb82829e680e0c3e6abd8aff9cf
MD5 fa63ebfffce7c16ca30745ad129bcc29
SHA1 cbe0298670b24cfe9e6cd465789af88a90836009
SHA512 9bc17f66192f02c2e3417f0dc92ed4e0729cf9c401612d7b721acb5ca83b15f41378410bb169f2794fe738b5563c0d5f3ecc07228e092131a79740e78f52b554
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpo:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpo
TLSH
T17663A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2164-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2164-13-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2792-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2792-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4688-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4688-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads