juko | f5ba8d969b2ce9a621e9fec4e14729e577198322db1e08a7955a975630a58137

General

Target
2026-05-06_31ae302b7af7df9b2413ae0a022c2344_elex_wannacry.exe
Size 49KB
Sample260506-phkhjsas9s
SHA256 f5ba8d969b2ce9a621e9fec4e14729e577198322db1e08a7955a975630a58137
MD5 31ae302b7af7df9b2413ae0a022c2344
SHA1 dee53e2d686a9a4b9d4333704944824c6b8f8010
SHA512 42c47ffb90234867c0f4bfb306ff9d104c34b73334226ce5df3c6c8938d8b14fd2929f77549cc855a912019f74a306f149acb401ec229ad6ad26ff8100c1c582
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h20:VLy2Kerc64CiGImVu8p4kojWh20
TLSH
T1C2334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/5212-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000021655-5.dat	family_juko
behavioral1/memory/5212-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1644-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b0000000242ab-15.dat	family_juko
behavioral1/memory/2868-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2868-19-0x0000000000400000-0x0000000000420000-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-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	2026-05-06_31ae302b7af7df9b2413ae0a022c2344_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
1644	WINWORD.exe
2868	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-1-5-21-643422742-1162610606-620613169-1000\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	2026-05-06_31ae302b7af7df9b2413ae0a022c2344_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
5076	PING.EXE
4580	cmd.exe
5752	PING.EXE
4672	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5752	PING.EXE
4672	PING.EXE
5076	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5212 wrote to memory of 1644	5212	2026-05-06_31ae302b7af7df9b2413ae0a022c2344_elex_wannacry.exe	86
PID 1644 wrote to memory of 4580	1644	WINWORD.exe	87
PID 4580 wrote to memory of 5752	4580	cmd.exe	89
PID 4580 wrote to memory of 4672	4580	cmd.exe	90
PID 4580 wrote to memory of 5076	4580	cmd.exe	91
PID 4580 wrote to memory of 2868	4580	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-05-06_31ae302b7af7df9b2413ae0a022c2344_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-06_31ae302b7af7df9b2413ae0a022c2344_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5212
- 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:1644
- - 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\000050F7" 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:4580
  - - 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:5752
  - - 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:4672
  - - 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:5076
  - - 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:2868

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000050F7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000050F7
Size 49KB
SHA256 3eef631b3c9a9a384628be0c53f921e9fbbcf13566b5f1987a41b19e7269be4e
MD5 714b4137913b23e7adbcba65ea1c7976
SHA1 72f68253263942128eb196802d08dd8998e748b8
SHA512 e6dd45b4941de561fd6568391b69124fe171540d830110014514d0c91ec3a6519401f93b0f327860558d13fa352b405d4b7d430251c087bd36c3bdf3c7c46545
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h25:VLy2Kerc64CiGImVu8p4kojWh25
TLSH
T18A334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 f5ba8d969b2ce9a621e9fec4e14729e577198322db1e08a7955a975630a58137
MD5 31ae302b7af7df9b2413ae0a022c2344
SHA1 dee53e2d686a9a4b9d4333704944824c6b8f8010
SHA512 42c47ffb90234867c0f4bfb306ff9d104c34b73334226ce5df3c6c8938d8b14fd2929f77549cc855a912019f74a306f149acb401ec229ad6ad26ff8100c1c582
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h20:VLy2Kerc64CiGImVu8p4kojWh20
TLSH
T1C2334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1644-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2868-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2868-18-0x0000000002600000-0x0000000002607000-memory.dmp

Download

memory/2868-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5212-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5212-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads