juko | 8b1aa3b85aa00c5c2101c4c4173091aa91d1b29fa600904d914be5cd36302d04

Analysis

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

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
11/05/2026, 04:49

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General

Target
2026-05-11_acfa62ca0a9b973acff473c7179bdab4_elex_wannacry.exe
Size 37KB
Sample260511-ff5w2abv5w
SHA256 8b1aa3b85aa00c5c2101c4c4173091aa91d1b29fa600904d914be5cd36302d04
MD5 acfa62ca0a9b973acff473c7179bdab4
SHA1 bac4b8e7f274c6bebcd8636063f0e651ad55c1fe
SHA512 d4da46a7a20dcd1564f4988ae097d76abec8670009d3306074626dfafa03d15a9a8113dc2da7c33195159f01de8cb1e5bc6825e7011aecc7715291e8a9317edc
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaY:3LsF2Kerc64sTiX2IV0DhuogwL
TLSH
T15C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/1080-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000a00000000d3db-5.dat	family_juko
behavioral2/memory/1080-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4248-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b30b-17.dat	family_juko
behavioral2/memory/4760-19-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4760-21-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4248	WINWORD.exe
4760	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-1-5-21-3119821332-640943685-2562343641-1000\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	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	2026-05-11_acfa62ca0a9b973acff473c7179bdab4_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

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
3844	PING.EXE
1488	PING.EXE
2444	PING.EXE
540	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2444	PING.EXE
3844	PING.EXE
1488	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1080 wrote to memory of 4248	1080	2026-05-11_acfa62ca0a9b973acff473c7179bdab4_elex_wannacry.exe	77
PID 4248 wrote to memory of 540	4248	WINWORD.exe	78
PID 540 wrote to memory of 3844	540	cmd.exe	80
PID 540 wrote to memory of 1488	540	cmd.exe	81
PID 540 wrote to memory of 2444	540	cmd.exe	82
PID 540 wrote to memory of 4760	540	cmd.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-05-11_acfa62ca0a9b973acff473c7179bdab4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_acfa62ca0a9b973acff473c7179bdab4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1080
- 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:4248
- - 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\00004222" 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:540
  - - 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:3844
  - - 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:1488
  - - 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:2444
  - - 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:4760

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

00004222

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004222
Size 37KB
SHA256 15f5fccba527d183d1dd826e3c850f21565f0d198ceb4c75387f13e2943c713d
MD5 f3097160a23131a40eb6ca776a5ddd1a
SHA1 f147e47fbde8642ca2bbe11805fc3609152c5e64
SHA512 83b7c63e01cea26d6d7269f878b0bef0903dca3fc6090a45057ee0baaf6cdd1cefb8ec9259dc47d55abcdc1984652193d3593611d04e7b28a3d5ae000b599ed0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywan:3LsF2Kerc64sTiX2IV0Dhuogw0
TLSH
T178034C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 8b1aa3b85aa00c5c2101c4c4173091aa91d1b29fa600904d914be5cd36302d04
MD5 acfa62ca0a9b973acff473c7179bdab4
SHA1 bac4b8e7f274c6bebcd8636063f0e651ad55c1fe
SHA512 d4da46a7a20dcd1564f4988ae097d76abec8670009d3306074626dfafa03d15a9a8113dc2da7c33195159f01de8cb1e5bc6825e7011aecc7715291e8a9317edc
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaY:3LsF2Kerc64sTiX2IV0DhuogwL
TLSH
T15C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1080-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/1080-13-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/1080-12-0x0000000000980000-0x0000000000A5F000-memory.dmp

Download

memory/4248-16-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4248-15-0x0000000000850000-0x000000000092F000-memory.dmp

Download

memory/4760-19-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4760-21-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4760-20-0x0000000000980000-0x0000000000A5F000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads