juko | 5e43861f284087f064cd8e196c733fe490c7ebea46b8ea53ca5be026fe9ef438

General

Target
2026-08-08_33acc206f47b192a8dc4992192d9d6dc_elex_wannacry.exe
Size 94KB
Sample260809-amfmtsga49
SHA256 5e43861f284087f064cd8e196c733fe490c7ebea46b8ea53ca5be026fe9ef438
MD5 33acc206f47b192a8dc4992192d9d6dc
SHA1 786b35c7d3a6b77c4a66db749982d0aeb8ae2631
SHA512 3bd2f6a023df52fb4a7ec495b7cb184198394b7a05faac82d8772b83444e5de7b8b47ed4a1bc8d2a15b3bb0f3c0a96388168d845603a968057c22fd841dc2457
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NA:RLy2Kerc64CiGImFYgUBWTb4/NA
TLSH
T1C6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/4104-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000b000000011371-5.dat	family_juko
behavioral2/memory/4104-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4272-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ed-13.dat	family_juko
behavioral2/memory/4672-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4672-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4272	WINWORD.exe
4672	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-1-5-21-4046655672-1449839301-2197395821-1000\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
5028	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	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	2026-08-08_33acc206f47b192a8dc4992192d9d6dc_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
1220	PING.EXE
5028	cmd.exe
5940	PING.EXE
5488	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5940	PING.EXE
5488	PING.EXE
1220	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4104 wrote to memory of 4272	4104	2026-08-08_33acc206f47b192a8dc4992192d9d6dc_elex_wannacry.exe	89
PID 4272 wrote to memory of 5028	4272	WINWORD.exe	90
PID 5028 wrote to memory of 5940	5028	cmd.exe	92
PID 5028 wrote to memory of 5488	5028	cmd.exe	93
PID 5028 wrote to memory of 1220	5028	cmd.exe	94
PID 5028 wrote to memory of 4672	5028	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_33acc206f47b192a8dc4992192d9d6dc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_33acc206f47b192a8dc4992192d9d6dc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4104
- 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:4272
- - 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\00004709" 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:5028
  - - 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:5940
  - - 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:5488
  - - 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:1220
  - - 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:4672

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:2504

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

Replay Monitor

Loading Replay Monitor...

Downloads

00004709

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004709
Size 94KB
SHA256 6aaed53c3720041ff00c488d0b95108b62a41dceef848df7d0c855858810f381
MD5 7c02228f78703ddb66cd511858a69a5b
SHA1 c520a0ca8db6be09b677c50a996f8df6d361181d
SHA512 53d17923ddb46372e88f07dd8ae911deee97e112ecee1b057d3c9eb3f73ad8b91e3046f2aebc8ef49696a0ba0114a33080a5c1df3392d10e249fccc76b6258b0
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NY:RLy2Kerc64CiGImFYgUBWTb4/NY
TLSH
T193937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 5e43861f284087f064cd8e196c733fe490c7ebea46b8ea53ca5be026fe9ef438
MD5 33acc206f47b192a8dc4992192d9d6dc
SHA1 786b35c7d3a6b77c4a66db749982d0aeb8ae2631
SHA512 3bd2f6a023df52fb4a7ec495b7cb184198394b7a05faac82d8772b83444e5de7b8b47ed4a1bc8d2a15b3bb0f3c0a96388168d845603a968057c22fd841dc2457
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NA:RLy2Kerc64CiGImFYgUBWTb4/NA
TLSH
T1C6937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4104-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4104-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4272-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4672-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4672-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads