juko | 1b81086bd9c47fe3cedee46653ca3e5d841cdcac05ee01928c08224c153ee081

Analysis

max time kernel
149s
max time network
153s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
09/05/2026, 23:50

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General

Target
2026-05-09_5c05edc1ced5ac6405b386d78400f3b7_elex_wannacry.exe
Size 57KB
Sample260509-3vsatahx2n
SHA256 1b81086bd9c47fe3cedee46653ca3e5d841cdcac05ee01928c08224c153ee081
MD5 5c05edc1ced5ac6405b386d78400f3b7
SHA1 545c730716940d12b09861592715d23cc7b43b45
SHA512 6d2b4c2d5b17dc345e01fe1adf972234c129bc22bb59485e09dd3e9e8fd0bc7d6038b0f08f718251764df5286a49eb3a7a58e4f220e8cab5d5fd83b5b3c79fca
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQr:qLy2Kerc64CiGImklNUyp8Tw
TLSH
T1F2433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/1800-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x003300000002b13e-5.dat	family_juko
behavioral2/memory/1800-13-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4608-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b33b-17.dat	family_juko
behavioral2/memory/1120-19-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1120-28-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4608	WINWORD.exe
1120	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-1-5-21-1383858298-2057492509-1726743289-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-09_5c05edc1ced5ac6405b386d78400f3b7_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

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
3128	PING.EXE
4976	cmd.exe
3252	PING.EXE
4248	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3128	PING.EXE
3252	PING.EXE
4248	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1800 wrote to memory of 4608	1800	2026-05-09_5c05edc1ced5ac6405b386d78400f3b7_elex_wannacry.exe	80
PID 4608 wrote to memory of 4976	4608	WINWORD.exe	81
PID 4976 wrote to memory of 3252	4976	cmd.exe	83
PID 4976 wrote to memory of 4248	4976	cmd.exe	84
PID 4976 wrote to memory of 3128	4976	cmd.exe	85
PID 4976 wrote to memory of 1120	4976	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-09_5c05edc1ced5ac6405b386d78400f3b7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-09_5c05edc1ced5ac6405b386d78400f3b7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1800
- 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:4608
- - 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:4976
  - - 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:3252
  - - 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:4248
  - - 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:3128
  - - 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:1120

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 57KB
SHA256 f42558bcfaa16f0e58e9c8edf7f1c66563518316f56409a582e24a0bc4301d10
MD5 3b1d24d289d826fbce8c87b8f1549a45
SHA1 0ccc3c700693e21de41ca728093e7641f95b2ad9
SHA512 10d46f7de19fe1b4c64663c1a77c3415dbd0a80837db4f78562216df69e2d15320a49c9ce9f835e1ea57a61ed47d51bd13e7277c8a1daee1c06c622b25d13e72
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQf:qLy2Kerc64CiGImklNUyp8T0
TLSH
T154433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 1b81086bd9c47fe3cedee46653ca3e5d841cdcac05ee01928c08224c153ee081
MD5 5c05edc1ced5ac6405b386d78400f3b7
SHA1 545c730716940d12b09861592715d23cc7b43b45
SHA512 6d2b4c2d5b17dc345e01fe1adf972234c129bc22bb59485e09dd3e9e8fd0bc7d6038b0f08f718251764df5286a49eb3a7a58e4f220e8cab5d5fd83b5b3c79fca
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQr:qLy2Kerc64CiGImklNUyp8Tw
TLSH
T1F2433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1120-19-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1120-20-0x00000000006A0000-0x00000000006C5000-memory.dmp

Download

memory/1120-28-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1800-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1800-13-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1800-12-0x00000000005C0000-0x00000000005E5000-memory.dmp

Download

memory/4608-15-0x0000000000A50000-0x0000000000A75000-memory.dmp

Download

memory/4608-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads