juko | 15d17f051815002629e8d7c12183fc9b479af97d2a31ba85517f52cfd513086a

General

Target
2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe
Size 87KB
Sample260730-krt15avbla
SHA256 15d17f051815002629e8d7c12183fc9b479af97d2a31ba85517f52cfd513086a
MD5 8d6c435a77feb52f4f7143f303793088
SHA1 44cf8af82724d8425c2706be4f042bb0de0ae16b
SHA512 d44feb672863b8681c6919388b3acebf75dc6c29f0c0a8e28a83c20cb2c14c09d280adde011aa804b281f07a438f603d536cf06331daef7711ef39f9c6db1d9d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T1C493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4936-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b86e-5.dat	family_juko
behavioral2/memory/4936-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5708-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001000000001c57d-13.dat	family_juko
behavioral2/memory/4508-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4508-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5708	WINWORD.exe
4508	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-1-5-21-552508041-2681165170-3229858294-1000\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
3368	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	2026-07-30_8d6c435a77feb52f4f7143f303793088_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
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
3368	cmd.exe
5472	PING.EXE
5004	PING.EXE
3068	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5472	PING.EXE
5004	PING.EXE
3068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4936 wrote to memory of 5708	4936	2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe	89
PID 5708 wrote to memory of 3368	5708	WINWORD.exe	90
PID 3368 wrote to memory of 5472	3368	cmd.exe	92
PID 3368 wrote to memory of 5004	3368	cmd.exe	93
PID 3368 wrote to memory of 3068	3368	cmd.exe	94
PID 3368 wrote to memory of 4508	3368	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_8d6c435a77feb52f4f7143f303793088_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4936
- 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:5708
- - 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\00006C8B" 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:3368
  - - 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:5472
  - - 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:5004
  - - 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:3068
  - - 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:4508

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

00006C8B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006C8B
Size 87KB
SHA256 4ba4d9b8af0e7aa6e93f93a84a2317b9c91f5ed8e0ed0c5f1151f7d4baf235ed
MD5 4f3d4fbadd62b96386effd7fd506686e
SHA1 35d0efae032c1764ead418577527a4bdb4bdb370
SHA512 6dadde1a1944623dbfc0ef2e38b26a9aa26aaf83e3d19ce22053520321f3586f56d8aa2c982e23b52ef6132a0eaec61f6f699fd358b59f7d5135ba6d588eab2a
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpR:2Ly2Kerc64CiGIm1K851YO6EQkwpR
TLSH
T19593A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 15d17f051815002629e8d7c12183fc9b479af97d2a31ba85517f52cfd513086a
MD5 8d6c435a77feb52f4f7143f303793088
SHA1 44cf8af82724d8425c2706be4f042bb0de0ae16b
SHA512 d44feb672863b8681c6919388b3acebf75dc6c29f0c0a8e28a83c20cb2c14c09d280adde011aa804b281f07a438f603d536cf06331daef7711ef39f9c6db1d9d
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpj:2Ly2Kerc64CiGIm1K851YO6EQkwpj
TLSH
T1C493A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4508-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4508-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4936-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4936-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5708-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads