juko | ab54a3086bbe163cda9799c14ee180cfe08b4a20de9caee44ce1256b4866e57b

General

Target
2026-08-18_49725d818851a1ca48ea2be92a886d28_elex_wannacry.exe
Size 68KB
Sample260818-3tw8daca52
SHA256 ab54a3086bbe163cda9799c14ee180cfe08b4a20de9caee44ce1256b4866e57b
MD5 49725d818851a1ca48ea2be92a886d28
SHA1 48a7796a2f4177df0d10245feaaf450b4a835091
SHA512 061dc73bc4324e9c6b834bfc0ea699fa6a359cd6deb146c329f108c25cb4a4254f55d6a7bd4a74acd0b93bc37c2f423f5f0d64338bd48ef46c777c424391facd
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpS:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpS
TLSH
T13C63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/4672-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cb5-5.dat	family_juko
behavioral2/memory/4672-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4456-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c515-13.dat	family_juko
behavioral2/memory/1992-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1992-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4456	WINWORD.exe
1992	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-1-5-21-2246396966-3025826688-3847171515-1000\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
2516	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-18_49725d818851a1ca48ea2be92a886d28_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
4876	PING.EXE
4520	PING.EXE
2516	cmd.exe
5752	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5752	PING.EXE
4876	PING.EXE
4520	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4672 wrote to memory of 4456	4672	2026-08-18_49725d818851a1ca48ea2be92a886d28_elex_wannacry.exe	90
PID 4456 wrote to memory of 2516	4456	WINWORD.exe	91
PID 2516 wrote to memory of 5752	2516	cmd.exe	93
PID 2516 wrote to memory of 4876	2516	cmd.exe	94
PID 2516 wrote to memory of 4520	2516	cmd.exe	95
PID 2516 wrote to memory of 1992	2516	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-18_49725d818851a1ca48ea2be92a886d28_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_49725d818851a1ca48ea2be92a886d28_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4672
- 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:4456
- - 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\000052F6" 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:2516
  - - 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:5752
  - - 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:4876
  - - 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:4520
  - - 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:1992

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

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Downloads

000052F6

Path C:\Users\Admin\AppData\Roaming\Mozilla\000052F6
Size 68KB
SHA256 31c2197ce8c6f956654b0bb2dfdac9056d72cd807e922af704861d1c5a77403a
MD5 4577ca3a816c11277c137db23a9c27e5
SHA1 a871498a66723ee8ac9ff3fc28d585c379bdb59a
SHA512 021f893f00f5ad116b3ef54f78cce17bcd54da35aa7ada2d80869a9781259bbd47a2b8daa63e0066017c11c9fae46e84c4b9fae1bb395adcd176d5c44d8b1c73
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpP:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpP
TLSH
T1D663A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 ab54a3086bbe163cda9799c14ee180cfe08b4a20de9caee44ce1256b4866e57b
MD5 49725d818851a1ca48ea2be92a886d28
SHA1 48a7796a2f4177df0d10245feaaf450b4a835091
SHA512 061dc73bc4324e9c6b834bfc0ea699fa6a359cd6deb146c329f108c25cb4a4254f55d6a7bd4a74acd0b93bc37c2f423f5f0d64338bd48ef46c777c424391facd
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpS:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpS
TLSH
T13C63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1992-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1992-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4456-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4672-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4672-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads