juko | ab0c53de8744e3eab6c5671ff046507a63453be5d76de56adf77e02291c68966

General

Target
2026-05-22_ef6758896c7ff1c9d33fc74f0964bfdb_elex_wannacry.exe
Size 30KB
Sample260522-cendtact4p
SHA256 ab0c53de8744e3eab6c5671ff046507a63453be5d76de56adf77e02291c68966
MD5 ef6758896c7ff1c9d33fc74f0964bfdb
SHA1 6d04c0d1c146d2e1b6d5f78f155ce7c418190083
SHA512 e8f7f1bbac5eeb2139a982c1ac19eecfc6453b239446ef11efe44ac451e587bc82b3ee3a9b53dd18fff71a8a4109d513235f79f575a30e7224dfb9e084aa28d9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXT:tLsF2Kerc64sTiX2IV0DzloT
TLSH
T13BE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x002300000002b2f1-4.dat	family_juko
behavioral2/files/0x001b00000002b476-9.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2728	WINWORD.exe
2436	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-1-5-21-1636999435-3883760687-346127294-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-22_ef6758896c7ff1c9d33fc74f0964bfdb_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
3224	PING.EXE
3276	PING.EXE
4524	PING.EXE
908	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3224	PING.EXE
3276	PING.EXE
4524	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2988 wrote to memory of 2728	2988	2026-05-22_ef6758896c7ff1c9d33fc74f0964bfdb_elex_wannacry.exe	80
PID 2728 wrote to memory of 908	2728	WINWORD.exe	81
PID 908 wrote to memory of 3224	908	cmd.exe	83
PID 908 wrote to memory of 3276	908	cmd.exe	84
PID 908 wrote to memory of 4524	908	cmd.exe	85
PID 908 wrote to memory of 2436	908	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-22_ef6758896c7ff1c9d33fc74f0964bfdb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-22_ef6758896c7ff1c9d33fc74f0964bfdb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2988
- 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:2728
- - 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\00002644" 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:908
  - - 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:3224
  - - 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:3276
  - - 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:4524
  - - 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:2436

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

00002644

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002644
Size 30KB
SHA256 4a67e4da2d8dbf5a739372b931621bf7673387815f31c97cdb4c363530d3ff56
MD5 ea16ce6bf70556d42641449daf8299a2
SHA1 8cbae83f76a9f63b6c08d060b1bfa48c270f14b1
SHA512 f844a3d13d488513ab26ba520497c7cbe28246c01b9f22ad4ab776257c520cdfa34c9e2bac1258fc87027418fae790b6a0f4564d198e7949b587df0e8b39b1db
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX3:tLsF2Kerc64sTiX2IV0Dzlo3
TLSH
T109E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 ab0c53de8744e3eab6c5671ff046507a63453be5d76de56adf77e02291c68966
MD5 ef6758896c7ff1c9d33fc74f0964bfdb
SHA1 6d04c0d1c146d2e1b6d5f78f155ce7c418190083
SHA512 e8f7f1bbac5eeb2139a982c1ac19eecfc6453b239446ef11efe44ac451e587bc82b3ee3a9b53dd18fff71a8a4109d513235f79f575a30e7224dfb9e084aa28d9
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXT:tLsF2Kerc64sTiX2IV0DzloT
TLSH
T13BE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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