juko | e053f262d978ef463418e287030fa2cd423dda7f0237331ac23ec197ce9c34ce

General

Target
2026-07-28_2074aacfca335fa6dfd6c65c5a3d1afe_elex_wannacry.exe
Size 37KB
Sample260728-3ethyaz1hx
SHA256 e053f262d978ef463418e287030fa2cd423dda7f0237331ac23ec197ce9c34ce
MD5 2074aacfca335fa6dfd6c65c5a3d1afe
SHA1 145d5b4068edade0f042e3eeaae2814dd1a94df7
SHA512 5f5db7ea4b56583068a5190810e253aac4e219bfdbed166492c9b6a5303d667c333ebcbb07507f58c13c6e0a382cd9cf3820eb2fd784ab2c680a3fd15edc5093
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywad:3LsF2Kerc64sTiX2IV0Dhuogwi
TLSH
T1BD035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/2348-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f000000016ccb-5.dat	family_juko
behavioral2/memory/2348-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2580-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c66b-13.dat	family_juko
behavioral2/memory/2240-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2240-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2580	WINWORD.exe
2240	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-1-5-21-1014449518-1831897916-4205727055-1000\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
3876	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	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	2026-07-28_2074aacfca335fa6dfd6c65c5a3d1afe_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
3876	cmd.exe
3912	PING.EXE
1196	PING.EXE
2460	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3912	PING.EXE
1196	PING.EXE
2460	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 2580	2348	2026-07-28_2074aacfca335fa6dfd6c65c5a3d1afe_elex_wannacry.exe	90
PID 2580 wrote to memory of 3876	2580	WINWORD.exe	91
PID 3876 wrote to memory of 3912	3876	cmd.exe	93
PID 3876 wrote to memory of 1196	3876	cmd.exe	94
PID 3876 wrote to memory of 2460	3876	cmd.exe	95
PID 3876 wrote to memory of 2240	3876	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-28_2074aacfca335fa6dfd6c65c5a3d1afe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_2074aacfca335fa6dfd6c65c5a3d1afe_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2348
- 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:2580
- - 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\00003C5B" 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:3876
  - - 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:3912
  - - 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:1196
  - - 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:2460
  - - 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:2240

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

00003C5B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003C5B
Size 37KB
SHA256 c62c8aa35ed70523f5631cc71009b1b2286fb0961ba1124d52d9d6402a6118f9
MD5 821a6a74cea22bea9fa3dae118f09a26
SHA1 33962bf2d1eee3aee1e54e779cf6a33f0c03fae2
SHA512 f25101963cec7cb13d7a069dfe3f976a7f76bb714f4aeae88763a4d0cc6e732afd35c67de56a2c25979b96ee28aea7385456ff7aa3a4bfb08e23c6d261eb8e43
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0Dhuogwy
TLSH
T1E0035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 e053f262d978ef463418e287030fa2cd423dda7f0237331ac23ec197ce9c34ce
MD5 2074aacfca335fa6dfd6c65c5a3d1afe
SHA1 145d5b4068edade0f042e3eeaae2814dd1a94df7
SHA512 5f5db7ea4b56583068a5190810e253aac4e219bfdbed166492c9b6a5303d667c333ebcbb07507f58c13c6e0a382cd9cf3820eb2fd784ab2c680a3fd15edc5093
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywad:3LsF2Kerc64sTiX2IV0Dhuogwi
TLSH
T1BD035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2240-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2240-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2348-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2348-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2580-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads