juko | 43668306d4fda738d1e6f1140cf00701ca2fac3f7191142aa2a0be930c2827f4

General

Target
2026-04-17_4dfd10ffabd351832d9e7432397b200f_elex_wannacry.exe
Size 32KB
Sample260417-shetvads9s
SHA256 43668306d4fda738d1e6f1140cf00701ca2fac3f7191142aa2a0be930c2827f4
MD5 4dfd10ffabd351832d9e7432397b200f
SHA1 b839e8c383f180e436e1aab16e4c964ec67539a7
SHA512 1e28380eb4ba105a8c816c31cd2f045dc7cea5bcbf97e945a91c4f55a686a9bc1a963956afd963c8bdd79a0d803006c271113104ea50d283dc5a08e92bbff6e5
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7K:ZLsF2Kerc64sTiX2IV0DKy7K
TLSH
T1CCE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x001b00000002b331-4.dat	family_juko
behavioral2/files/0x001b00000002b338-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1552	WINWORD.exe
3960	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-1-5-21-2122505878-652277452-2375749442-1000\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	2026-04-17_4dfd10ffabd351832d9e7432397b200f_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
3712	PING.EXE
468	PING.EXE
2380	PING.EXE
1808	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2380	PING.EXE
3712	PING.EXE
468	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1868 wrote to memory of 1552	1868	2026-04-17_4dfd10ffabd351832d9e7432397b200f_elex_wannacry.exe	80
PID 1552 wrote to memory of 1808	1552	WINWORD.exe	81
PID 1808 wrote to memory of 3712	1808	cmd.exe	83
PID 1808 wrote to memory of 468	1808	cmd.exe	84
PID 1808 wrote to memory of 2380	1808	cmd.exe	85
PID 1808 wrote to memory of 3960	1808	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-17_4dfd10ffabd351832d9e7432397b200f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-17_4dfd10ffabd351832d9e7432397b200f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1868
- 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:1552
- - 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\00007905" 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:1808
  - - 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:3712
  - - 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:468
  - - 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:2380
  - - 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:3960

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

00007905

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007905
Size 32KB
SHA256 af78c2be8e4c52d7c17dc9d48fafabb6b9458eb44db456abd7745ce901a1d62d
MD5 bf3efd46a13358cc576af0e170abae1d
SHA1 30f75eefbc98faa9b36ce38ed9c08ddfdfe2a896
SHA512 e49a0d6a0f6eb7ca4dc16282eeee9c2b6ee2408a9002e86a954c0487aa66ef21ccd2e45f242eb3766ff7fc0082bba44091334a57379d941cf3a9c60a94657940
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7j:ZLsF2Kerc64sTiX2IV0DKy7j
TLSH
T17BE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 43668306d4fda738d1e6f1140cf00701ca2fac3f7191142aa2a0be930c2827f4
MD5 4dfd10ffabd351832d9e7432397b200f
SHA1 b839e8c383f180e436e1aab16e4c964ec67539a7
SHA512 1e28380eb4ba105a8c816c31cd2f045dc7cea5bcbf97e945a91c4f55a686a9bc1a963956afd963c8bdd79a0d803006c271113104ea50d283dc5a08e92bbff6e5
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7K:ZLsF2Kerc64sTiX2IV0DKy7K
TLSH
T1CCE23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads