juko | 991c2014f341e04d78b2fef12c8e611648134610d3e6eb93f87f36529b00ea92

General

Target
2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe
Size 105KB
Sample260417-rwb5facv5v
SHA256 991c2014f341e04d78b2fef12c8e611648134610d3e6eb93f87f36529b00ea92
MD5 1eeefded5a6e0c5c1d0e7b637e102da0
SHA1 48d2ce244c437e99030dd84e959107bcd0fb17b1
SHA512 8fa6c7df4eee3f62cc337f706897d749b755a08fa2c5786d6ac559305a2b531b11bc5c000033c1b67d37ab56c9e539dac219a426e90d6a68ef3f1c407359ebbb
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHF5:XLsF2Kerc64sTiX2IV0DpK5
TLSH
T190B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
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/0x000d000000029ee3-4.dat	family_juko
behavioral2/files/0x001b00000002b44d-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3116	WINWORD.exe
4388	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-1-5-21-2397528088-2630719772-1129911217-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.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
2140	PING.EXE
5096	cmd.exe
4180	PING.EXE
1112	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4180	PING.EXE
1112	PING.EXE
2140	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 3116	2228	2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe	79
PID 3116 wrote to memory of 5096	3116	WINWORD.exe	80
PID 5096 wrote to memory of 4180	5096	cmd.exe	82
PID 5096 wrote to memory of 1112	5096	cmd.exe	83
PID 5096 wrote to memory of 2140	5096	cmd.exe	84
PID 5096 wrote to memory of 4388	5096	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-17_1eeefded5a6e0c5c1d0e7b637e102da0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2228
- 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:3116
- - 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\000028AA" 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:5096
  - - 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:4180
  - - 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:1112
  - - 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:2140
  - - 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:4388

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

000028AA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000028AA
Size 105KB
SHA256 5ba1877b1ea13b69a7c224d3546d6d6164425ee3553a036d4e8ab0a866e7df73
MD5 8c309c19a003b26601b7956c6e171945
SHA1 9cc1b9dbb56b0e71b0b5a6d4690e20963c88a672
SHA512 8c0bf857268c1da0aee8ebd74c6342151510a12f3dd3cb6bafa5b45ed3cebcea301fc0ac4996c64e5a753ad20737cacf40ca99ad26a63cc010a2e706b34a34a4
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFq:XLsF2Kerc64sTiX2IV0DpKq
TLSH
T14AB32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 105KB
SHA256 991c2014f341e04d78b2fef12c8e611648134610d3e6eb93f87f36529b00ea92
MD5 1eeefded5a6e0c5c1d0e7b637e102da0
SHA1 48d2ce244c437e99030dd84e959107bcd0fb17b1
SHA512 8fa6c7df4eee3f62cc337f706897d749b755a08fa2c5786d6ac559305a2b531b11bc5c000033c1b67d37ab56c9e539dac219a426e90d6a68ef3f1c407359ebbb
SSDEEP 768:lZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHF5:XLsF2Kerc64sTiX2IV0DpK5
TLSH
T190B32A2B2AA57052C59320B0F9591F34C43D9DB9016BB0A2F7457B6928B2D63CF71ECE
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