juko | 259e5d40caa62a86e3320c97205c6a6df92e505cb21484e954748710852b608f

General

Target
2026-05-27_7155013421aef5a6a5accf54fa6268f2_elex_wannacry.exe
Size 47KB
Sample260527-e6w65sfs2q
SHA256 259e5d40caa62a86e3320c97205c6a6df92e505cb21484e954748710852b608f
MD5 7155013421aef5a6a5accf54fa6268f2
SHA1 dcb8ec1196c0fe83283c1105aa0eaea2e4e0829c
SHA512 323a1a0813fe78284ff53e9fdcd93b5e7c1a498a123f99033a166d87aecbff845c7b9984ba84fea9af2619b730232c344618e24472c9e59a42b17cc702a6dedb
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJC:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxQ
TLSH
T1D8235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000700000000d34a-4.dat	family_juko
behavioral2/files/0x001d00000002b39b-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4212	WINWORD.exe
4344	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-1-5-21-2654269261-3199571979-4291878722-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-27_7155013421aef5a6a5accf54fa6268f2_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

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
3692	cmd.exe
1932	PING.EXE
4184	PING.EXE
3700	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1932	PING.EXE
4184	PING.EXE
3700	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2140 wrote to memory of 4212	2140	2026-05-27_7155013421aef5a6a5accf54fa6268f2_elex_wannacry.exe	81
PID 4212 wrote to memory of 3692	4212	WINWORD.exe	82
PID 3692 wrote to memory of 1932	3692	cmd.exe	84
PID 3692 wrote to memory of 4184	3692	cmd.exe	85
PID 3692 wrote to memory of 3700	3692	cmd.exe	86
PID 3692 wrote to memory of 4344	3692	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-27_7155013421aef5a6a5accf54fa6268f2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_7155013421aef5a6a5accf54fa6268f2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2140
- 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:4212
- - 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\00007B94" 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:3692
  - - 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:1932
  - - 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:4184
  - - 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:3700
  - - 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:4344

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

00007B94

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007B94
Size 47KB
SHA256 c4c557ae98464e252a617afb429d498ee05eb7d7349eead3d22a665a372f009f
MD5 7a629bd3a61fbc931ec86df2b868ee84
SHA1 ada97ef134f5042c312b78e88975df8316783bb9
SHA512 9c5eb6cbdbc61d26a608afa3deb25cd9ab012bae9cc761e8c445db20acea76cf8ccae329257fb9493cc790b2862ee577f367b713efdb424643c9907a8af67789
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJA:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxi
TLSH
T1FB235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 259e5d40caa62a86e3320c97205c6a6df92e505cb21484e954748710852b608f
MD5 7155013421aef5a6a5accf54fa6268f2
SHA1 dcb8ec1196c0fe83283c1105aa0eaea2e4e0829c
SHA512 323a1a0813fe78284ff53e9fdcd93b5e7c1a498a123f99033a166d87aecbff845c7b9984ba84fea9af2619b730232c344618e24472c9e59a42b17cc702a6dedb
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJC:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxQ
TLSH
T1D8235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads