juko | 2599ad8a3a304b14c24206fc6dde124e0e350e4b49d7db0ef5b1a4bf6b5b84d2

Analysis

max time kernel
149s
max time network
140s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
04/05/2026, 04:27

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General

Target
2026-05-04_d9a4e58adae54563b2e0e60ecadb2d64_elex_wannacry.exe
Size 88KB
Sample260504-e3d66afz8j
SHA256 2599ad8a3a304b14c24206fc6dde124e0e350e4b49d7db0ef5b1a4bf6b5b84d2
MD5 d9a4e58adae54563b2e0e60ecadb2d64
SHA1 921263566cbe88044168d6217f7e946d5de8b895
SHA512 0f7e787aa2cd870ea52345816374c26600b17edbe9e3d9e0aed7fe310b9a808fe606895116aabdd41edb1d03a13daf7bdf085f53c219a09c56dbf06c68d377c3
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrss:zLy2Kerc64CiGImHc/28wzCBlycJWeer
TLSH
T115933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/4956-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000700000002a7e0-5.dat	family_juko
behavioral2/memory/4956-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2680-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3b4-17.dat	family_juko
behavioral2/memory/6140-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/6140-28-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2680	WINWORD.exe
6140	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-1-5-21-2397528088-2630719772-1129911217-1000\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

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	2026-05-04_d9a4e58adae54563b2e0e60ecadb2d64_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
5424	cmd.exe
5104	PING.EXE
5848	PING.EXE
5628	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5104	PING.EXE
5848	PING.EXE
5628	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4956 wrote to memory of 2680	4956	2026-05-04_d9a4e58adae54563b2e0e60ecadb2d64_elex_wannacry.exe	79
PID 2680 wrote to memory of 5424	2680	WINWORD.exe	80
PID 5424 wrote to memory of 5104	5424	cmd.exe	82
PID 5424 wrote to memory of 5848	5424	cmd.exe	83
PID 5424 wrote to memory of 5628	5424	cmd.exe	84
PID 5424 wrote to memory of 6140	5424	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-04_d9a4e58adae54563b2e0e60ecadb2d64_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_d9a4e58adae54563b2e0e60ecadb2d64_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4956
- 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:2680
- - 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\00006387" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5424
  - - 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:5104
  - - 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:5848
  - - 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:5628
  - - 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:6140

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00006387

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006387
Size 88KB
SHA256 1aaa1188dd62d4bebb015ddafc1b1fb9db264382faa3ca65e9565c1306083899
MD5 aa55ceb55eb9c3f91ec10d0d38ffe5b7
SHA1 c8f78d4527dea563ec49fb9ff023ea4c7c66f6fd
SHA512 f6721d5efce3f8c06360440a1ce04bd765e19ef85c84cb87ce692afb6bb434d4a2e71122246ddcdf848661e8c44f15a60d58a40b8e0c595c1638681b99f87232
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsk:zLy2Kerc64CiGImHc/28wzCBlycJWeeH
TLSH
T1FF933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 2599ad8a3a304b14c24206fc6dde124e0e350e4b49d7db0ef5b1a4bf6b5b84d2
MD5 d9a4e58adae54563b2e0e60ecadb2d64
SHA1 921263566cbe88044168d6217f7e946d5de8b895
SHA512 0f7e787aa2cd870ea52345816374c26600b17edbe9e3d9e0aed7fe310b9a808fe606895116aabdd41edb1d03a13daf7bdf085f53c219a09c56dbf06c68d377c3
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrss:zLy2Kerc64CiGImHc/28wzCBlycJWeer
TLSH
T115933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2680-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2680-15-0x0000000002240000-0x0000000002301000-memory.dmp

Download

memory/4956-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4956-12-0x0000000002130000-0x00000000021F1000-memory.dmp

Download

memory/4956-13-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/6140-19-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/6140-20-0x00000000026F0000-0x00000000027B1000-memory.dmp

Download

memory/6140-28-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads