juko | c93a278b195c084b9ddbbb4cc257c5a70264c56366c3d8d721a13b97d27ddca3

General

Target
2026-08-12_b20f0f6df54d6115fbfb8e899f6ac906_elex_wannacry.exe
Size 49KB
Sample260812-d2m71axglb
SHA256 c93a278b195c084b9ddbbb4cc257c5a70264c56366c3d8d721a13b97d27ddca3
MD5 b20f0f6df54d6115fbfb8e899f6ac906
SHA1 a90793762f7ed3af03c5bb1145e051ca78aeb1e5
SHA512 b3a091c78ac15f392c02eb53949db0bbcc608104544260d2b0568717d2df4c47e3b616a1bbd334ae071f07b7354e822f51ffadc1a4e3169040a3869df085f45d
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:4Ly2Kerc64CiGImVu8p4kojWh2e
TLSH
T1CB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4336-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e000000000426-5.dat	family_juko
behavioral2/memory/4336-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2256-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0004000000016cc3-13.dat	family_juko
behavioral2/memory/2504-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2504-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2256	WINWORD.exe
2504	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-1-5-21-1875162379-3804078649-638427191-1000\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
2044	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	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	2026-08-12_b20f0f6df54d6115fbfb8e899f6ac906_elex_wannacry.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
2044	cmd.exe
4856	PING.EXE
4092	PING.EXE
1916	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4856	PING.EXE
4092	PING.EXE
1916	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4336 wrote to memory of 2256	4336	2026-08-12_b20f0f6df54d6115fbfb8e899f6ac906_elex_wannacry.exe	89
PID 2256 wrote to memory of 2044	2256	WINWORD.exe	90
PID 2044 wrote to memory of 4856	2044	cmd.exe	92
PID 2044 wrote to memory of 4092	2044	cmd.exe	93
PID 2044 wrote to memory of 1916	2044	cmd.exe	94
PID 2044 wrote to memory of 2504	2044	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-12_b20f0f6df54d6115fbfb8e899f6ac906_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_b20f0f6df54d6115fbfb8e899f6ac906_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4336
- 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:2256
- - 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\000011A8" 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:2044
  - - 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:4856
  - - 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:4092
  - - 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:1916
  - - 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: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

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Downloads

000011A8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000011A8
Size 49KB
SHA256 b0081dd74543373dd4485e68c574b6b142e51aab1429c3df85aedaa225cb34b8
MD5 6e9fb6d70ac8187d39e4c16548387a6a
SHA1 f9a74d2bedb72226d08c008a4ad1914d8e4f62ef
SHA512 63949d5577bffd6647ec65e53c65996faf058e9e9299a6d1ab243b8ee8833b80027d1d7bad0c341b00bf0048148822c5018193b2e2f191cc0ad80278e44f1da6
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2Q:4Ly2Kerc64CiGImVu8p4kojWh2Q
TLSH
T1BC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 c93a278b195c084b9ddbbb4cc257c5a70264c56366c3d8d721a13b97d27ddca3
MD5 b20f0f6df54d6115fbfb8e899f6ac906
SHA1 a90793762f7ed3af03c5bb1145e051ca78aeb1e5
SHA512 b3a091c78ac15f392c02eb53949db0bbcc608104544260d2b0568717d2df4c47e3b616a1bbd334ae071f07b7354e822f51ffadc1a4e3169040a3869df085f45d
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:4Ly2Kerc64CiGImVu8p4kojWh2e
TLSH
T1CB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2256-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2504-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2504-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4336-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4336-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads