juko | 753b625fca663ef544f61d7b8048cc0514fd7057613dd7e57d750dc14d3dce79

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
03/05/2026, 16:06

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General

Target
2026-05-03_f74b5d5a89d14233f45577d4328f9ecf_elex_wannacry.exe
Size 94KB
Sample260503-tkknjsgt5r
SHA256 753b625fca663ef544f61d7b8048cc0514fd7057613dd7e57d750dc14d3dce79
MD5 f74b5d5a89d14233f45577d4328f9ecf
SHA1 198b3b65b03cc77f514c56fd8b9b85f37a26693d
SHA512 7a3995e210816fde0ee63441227c3c805bb246455b749c3234534d4bc64cf5acf10c029ba357cc778861db8edb0fafb732b58f0efa959ec6a6006406552a0d00
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Np:RLy2Kerc64CiGImFYgUBWTb4/Np
TLSH
T144937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/4628-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f000000028e1b-5.dat	family_juko
behavioral2/memory/4628-13-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/3004-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b447-17.dat	family_juko
behavioral2/memory/4792-19-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4792-21-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3004	WINWORD.exe
4792	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-1-5-21-650218026-1419908266-2856590055-1000\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	2026-05-03_f74b5d5a89d14233f45577d4328f9ecf_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
4816	cmd.exe
3572	PING.EXE
5088	PING.EXE
4812	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3572	PING.EXE
5088	PING.EXE
4812	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4628 wrote to memory of 3004	4628	2026-05-03_f74b5d5a89d14233f45577d4328f9ecf_elex_wannacry.exe	79
PID 3004 wrote to memory of 4816	3004	WINWORD.exe	80
PID 4816 wrote to memory of 3572	4816	cmd.exe	82
PID 4816 wrote to memory of 5088	4816	cmd.exe	83
PID 4816 wrote to memory of 4812	4816	cmd.exe	84
PID 4816 wrote to memory of 4792	4816	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-03_f74b5d5a89d14233f45577d4328f9ecf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-03_f74b5d5a89d14233f45577d4328f9ecf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4628
- 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:3004
- - 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\00002482" 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:4816
  - - 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:3572
  - - 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:5088
  - - 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:4812
  - - 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:4792

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

00002482

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002482
Size 94KB
SHA256 bbba0532dc9834080c08e2715417c92b521f5761255a55bd64628059d9f154ef
MD5 28928976ac9aaafce55a6ce7821b80d7
SHA1 65c9618f743c91a484a5a213ad97094b4438afc8
SHA512 3bda64a95a571ab5eb01cb743282cd4e108249321d1bfe644d03ba1668e5b9cd19419284f4154063f75b67427b84fe137731810355ea1129d5749fc1b0a856f1
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Nr:RLy2Kerc64CiGImFYgUBWTb4/Nr
TLSH
T1FC937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 753b625fca663ef544f61d7b8048cc0514fd7057613dd7e57d750dc14d3dce79
MD5 f74b5d5a89d14233f45577d4328f9ecf
SHA1 198b3b65b03cc77f514c56fd8b9b85f37a26693d
SHA512 7a3995e210816fde0ee63441227c3c805bb246455b749c3234534d4bc64cf5acf10c029ba357cc778861db8edb0fafb732b58f0efa959ec6a6006406552a0d00
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Np:RLy2Kerc64CiGImFYgUBWTb4/Np
TLSH
T144937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3004-15-0x0000000000840000-0x00000000008BB000-memory.dmp

Download

memory/3004-16-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/4628-0-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/4628-13-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/4628-12-0x0000000000880000-0x00000000008FB000-memory.dmp

Download

memory/4792-19-0x0000000000400000-0x000000000042B000-memory.dmp

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memory/4792-20-0x00000000009B0000-0x0000000000A2B000-memory.dmp

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memory/4792-21-0x0000000000400000-0x000000000042B000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads