juko | 28f706281a445410933fdd94f29d69f77259bf30ce49957795817417b2de80cc

General

Target
2026-07-24_74efdf5838880fac4e4b309977555e63_elex_wannacry.exe
Size 39KB
Sample260724-xygetsdf44
SHA256 28f706281a445410933fdd94f29d69f77259bf30ce49957795817417b2de80cc
MD5 74efdf5838880fac4e4b309977555e63
SHA1 52d2fba5766af6a5ea089b8f49a2d6022c39d412
SHA512 4509521e86abacb575ea2abffe96bc1c54d05296700736041bb60b40d700c4d629ee6aa94954829c637a3269e57224f161111747b7510016e2626e238b853e6b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBp:aLsF2Kerc64sTiX2IV0DVyIGF2
TLSH
T1BD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4360-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cc1-5.dat	family_juko
behavioral2/memory/4360-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3244-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5cd-13.dat	family_juko
behavioral2/memory/4752-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4752-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3244	WINWORD.exe
4752	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-1-5-21-1875162379-3804078649-638427191-1000\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
4488	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-24_74efdf5838880fac4e4b309977555e63_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

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
4488	cmd.exe
4612	PING.EXE
3640	PING.EXE
4384	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4612	PING.EXE
3640	PING.EXE
4384	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4360 wrote to memory of 3244	4360	2026-07-24_74efdf5838880fac4e4b309977555e63_elex_wannacry.exe	89
PID 3244 wrote to memory of 4488	3244	WINWORD.exe	90
PID 4488 wrote to memory of 4612	4488	cmd.exe	92
PID 4488 wrote to memory of 3640	4488	cmd.exe	93
PID 4488 wrote to memory of 4384	4488	cmd.exe	94
PID 4488 wrote to memory of 4752	4488	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-24_74efdf5838880fac4e4b309977555e63_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-24_74efdf5838880fac4e4b309977555e63_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4360
- 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:3244
- - 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\00006CF1" 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:4488
  - - 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:4612
  - - 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:3640
  - - 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:4384
  - - 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:4752

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

00006CF1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006CF1
Size 39KB
SHA256 11bbb2d4e28e5b950b5c03bdef2ee4173237835804a08c47a2ebde2eb41b4f42
MD5 e526d35a28897e74ada833bf01267cec
SHA1 b620478d1de57341c4249c4063af91036931b951
SHA512 1b4e45f5f456c46a0e312e0caa672b7bc7e8d2dfb5464004cde9ee7a1acfb66cb9e8b23e69fae7baf8831992324fba16304b239415017e73c09ea31129712bb6
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBl:aLsF2Kerc64sTiX2IV0DVyIGFa
TLSH
T154036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 28f706281a445410933fdd94f29d69f77259bf30ce49957795817417b2de80cc
MD5 74efdf5838880fac4e4b309977555e63
SHA1 52d2fba5766af6a5ea089b8f49a2d6022c39d412
SHA512 4509521e86abacb575ea2abffe96bc1c54d05296700736041bb60b40d700c4d629ee6aa94954829c637a3269e57224f161111747b7510016e2626e238b853e6b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBp:aLsF2Kerc64sTiX2IV0DVyIGF2
TLSH
T1BD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3244-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4360-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4360-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4752-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4752-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads