juko | b543dd8a9edeb74dd2c9a14496e89c17690c216efe4c540e0584a896830136b2

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20260130-en
resource tags

arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
20/04/2026, 00:50

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General

Target
2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe
Size 49KB
Sample260420-a7bjlsay4x
SHA256 b543dd8a9edeb74dd2c9a14496e89c17690c216efe4c540e0584a896830136b2
MD5 ae00dd80ac146b767e225e9ff0b215f5
SHA1 1f952bbc685298b2a8bda2871ec5992ebda4959e
SHA512 c70fe1dfe67be5cac0858dca0fb149ccc2e82f153b59c6d3916767c5d772ae121e25bc687eead67bc3b1e3fa48b33f600db5d884d0fca4bfc94fb1e1c06c3baa
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h21:VLy2Kerc64CiGImVu8p4kojWh21
TLSH
T1D1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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
behavioral1/memory/4608-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b00000001f15c-5.dat	family_juko
behavioral1/memory/4608-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1444-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000243ed-17.dat	family_juko
behavioral1/memory/4904-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4904-21-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-721190819-434563495-2007910846-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1444	WINWORD.exe
4904	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-1-5-21-721190819-434563495-2007910846-1000\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	2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4840	PING.EXE
4444	cmd.exe
4888	PING.EXE
4776	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4888	PING.EXE
4776	PING.EXE
4840	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4608 wrote to memory of 1444	4608	2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe	85
PID 1444 wrote to memory of 4444	1444	WINWORD.exe	86
PID 4444 wrote to memory of 4888	4444	cmd.exe	88
PID 4444 wrote to memory of 4776	4444	cmd.exe	89
PID 4444 wrote to memory of 4840	4444	cmd.exe	90
PID 4444 wrote to memory of 4904	4444	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_ae00dd80ac146b767e225e9ff0b215f5_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4608
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1444
- - 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\00006080" 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:4444
  - - 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:4888
  - - 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:4776
  - - 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:4840
  - - 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:4904

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

Query Registry

T1012

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

00006080

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006080
Size 49KB
SHA256 0a33735aa757ddb52a888dc682dbfb819299cf9f490175047371e33ce4397642
MD5 661f4391edb1fff5cea782cbd2514f5a
SHA1 d35e9af08c42c0be6eafc10ee3d793713acbaeb0
SHA512 62011938004c4073a34de5b228fc21a5a53fd5d451129cf2a937f2738891dd03e75dd05854f8cc4f080aef33a218a9708b060cf867ca14d9026670b544a6f249
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2K:VLy2Kerc64CiGImVu8p4kojWh2K
TLSH
T101334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 b543dd8a9edeb74dd2c9a14496e89c17690c216efe4c540e0584a896830136b2
MD5 ae00dd80ac146b767e225e9ff0b215f5
SHA1 1f952bbc685298b2a8bda2871ec5992ebda4959e
SHA512 c70fe1dfe67be5cac0858dca0fb149ccc2e82f153b59c6d3916767c5d772ae121e25bc687eead67bc3b1e3fa48b33f600db5d884d0fca4bfc94fb1e1c06c3baa
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h21:VLy2Kerc64CiGImVu8p4kojWh21
TLSH
T1D1334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1444-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1444-15-0x00000000006C0000-0x000000000071F000-memory.dmp

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memory/4608-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4608-12-0x0000000002030000-0x000000000208F000-memory.dmp

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memory/4608-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4904-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4904-20-0x0000000002520000-0x000000000257F000-memory.dmp

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memory/4904-21-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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