juko | 52c2396d01d3e45c2cbba863ccb455c0d1adf75e292a6c0c249ac3ad561b4a00

General

Target
2026-08-02_494ad55f57d9d610a6ba2cc2ede8ad0b_elex_wannacry.exe
Size 37KB
Sample260802-1p7r7sserg
SHA256 52c2396d01d3e45c2cbba863ccb455c0d1adf75e292a6c0c249ac3ad561b4a00
MD5 494ad55f57d9d610a6ba2cc2ede8ad0b
SHA1 bacdc02f5f9be54a8350b7e8d0015501bec5347d
SHA512 4a39ff17c6baae6e05227b8ccc1aaa4473dbd8c7d04f02e6757fef3a78a49b1fe32996f884f62c87a47f79d8df47f66f221a370bff5d2b8e07bc1ac827606d75
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywav:3LsF2Kerc64sTiX2IV0Dhuogwo
TLSH
T11C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/3052-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001b85a-5.dat	family_juko
behavioral2/memory/3052-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3236-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c517-13.dat	family_juko
behavioral2/memory/2924-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2924-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3236	WINWORD.exe
2924	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-1-5-21-3611646547-550105268-947503007-1000\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
572	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	2026-08-02_494ad55f57d9d610a6ba2cc2ede8ad0b_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
572	cmd.exe
2532	PING.EXE
6016	PING.EXE
4124	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6016	PING.EXE
4124	PING.EXE
2532	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 3236	3052	2026-08-02_494ad55f57d9d610a6ba2cc2ede8ad0b_elex_wannacry.exe	89
PID 3236 wrote to memory of 572	3236	WINWORD.exe	90
PID 572 wrote to memory of 2532	572	cmd.exe	92
PID 572 wrote to memory of 6016	572	cmd.exe	93
PID 572 wrote to memory of 4124	572	cmd.exe	94
PID 572 wrote to memory of 2924	572	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_494ad55f57d9d610a6ba2cc2ede8ad0b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_494ad55f57d9d610a6ba2cc2ede8ad0b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3052
- 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:3236
- - 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\000049DC" 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:572
  - - 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:2532
  - - 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:6016
  - - 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:4124
  - - 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:2924

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

000049DC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000049DC
Size 37KB
SHA256 136c234baf2e5c6d884ffef03837509724692058b3abb5d9f74ae78a16960f09
MD5 bddab56984be40fc4a97b52df64a5927
SHA1 eeb0b10452e88d3c3ff03c689b6c1630f18cd0a4
SHA512 71aad562d388f383194b8b33353e83658372aaa9261104d0cb5312e25f63e4686c0b81bc2b9733274967968c8e0ce8a2f2cfb033f16ff43a3215b495c219d472
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaF:3LsF2Kerc64sTiX2IV0Dhuogw2
TLSH
T107035C1A299160A2D55310B0E9D82FB4C53D8C76146BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 52c2396d01d3e45c2cbba863ccb455c0d1adf75e292a6c0c249ac3ad561b4a00
MD5 494ad55f57d9d610a6ba2cc2ede8ad0b
SHA1 bacdc02f5f9be54a8350b7e8d0015501bec5347d
SHA512 4a39ff17c6baae6e05227b8ccc1aaa4473dbd8c7d04f02e6757fef3a78a49b1fe32996f884f62c87a47f79d8df47f66f221a370bff5d2b8e07bc1ac827606d75
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywav:3LsF2Kerc64sTiX2IV0Dhuogwo
TLSH
T11C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2924-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2924-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3052-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3052-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3236-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads