juko | ae0ff30eaab2c79d36037bd769682dfe5bcc948600bc35ca4b8cfa955207e780

General

Target
2026-07-06_dd79c5eac7bcdfe288e96600c96061e3_elex_wannacry.exe
Size 137KB
Sample260706-v5cdcaat3w
SHA256 ae0ff30eaab2c79d36037bd769682dfe5bcc948600bc35ca4b8cfa955207e780
MD5 dd79c5eac7bcdfe288e96600c96061e3
SHA1 52003fe0b535f91987d87e3a417a9885d052aefa
SHA512 ec702e82a3abeba1477745e99c935681f6f6cc015efdc6b8fd23e1c75f21e1c103b67bb9030b6af30b034ad2b3553cef6dfbe01f291d91074457624412092f24
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg5:+Ly2Kwc64YIcYjIDLCSiDaQq
TLSH
T12DD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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 8 IoCs

resource	yara_rule
behavioral1/memory/1544-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x00110000000231f3-5.dat	family_juko
behavioral1/memory/4756-11-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/1544-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/4756-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/files/0x00090000000244fd-16.dat	family_juko
behavioral1/memory/1184-18-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral1/memory/1184-19-0x0000000000400000-0x0000000000436000-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-07-06_dd79c5eac7bcdfe288e96600c96061e3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4756	WINWORD.exe
1184	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-1-5-21-3053180483-1881419501-3594244048-1000\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	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	2026-07-06_dd79c5eac7bcdfe288e96600c96061e3_elex_wannacry.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
4220	PING.EXE
1048	PING.EXE
3120	PING.EXE
1272	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4220	PING.EXE
1048	PING.EXE
3120	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1544 wrote to memory of 4756	1544	2026-07-06_dd79c5eac7bcdfe288e96600c96061e3_elex_wannacry.exe	84
PID 4756 wrote to memory of 1272	4756	WINWORD.exe	86
PID 1272 wrote to memory of 4220	1272	cmd.exe	88
PID 1272 wrote to memory of 1048	1272	cmd.exe	90
PID 1272 wrote to memory of 3120	1272	cmd.exe	91
PID 1272 wrote to memory of 1184	1272	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-07-06_dd79c5eac7bcdfe288e96600c96061e3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-06_dd79c5eac7bcdfe288e96600c96061e3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1544
- 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:4756
- - 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\0000681F" 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:1272
  - - 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:4220
  - - 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:1048
  - - 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:3120
  - - 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:1184

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

0000681F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000681F
Size 137KB
SHA256 a367c32d7d6043572fce335c3e357dd1b4777ed09987144440d4d17b1f879076
MD5 e204dbe2b40b00d85c20fe3a4e95426c
SHA1 6a961e8e23655d884d4b716b566a51eda2b883eb
SHA512 1db3daab7efc856faf977757432ede133c0e3758816325ecc87a4a5f3bc1b5f2eaff0fb54f9fa59322324bba8abc949059c851c4cd44c233a69c6402438ba348
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg2:+Ly2Kwc64YIcYjIDLCSiDaQ5
TLSH
T1D9D30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 137KB
SHA256 ae0ff30eaab2c79d36037bd769682dfe5bcc948600bc35ca4b8cfa955207e780
MD5 dd79c5eac7bcdfe288e96600c96061e3
SHA1 52003fe0b535f91987d87e3a417a9885d052aefa
SHA512 ec702e82a3abeba1477745e99c935681f6f6cc015efdc6b8fd23e1c75f21e1c103b67bb9030b6af30b034ad2b3553cef6dfbe01f291d91074457624412092f24
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg5:+Ly2Kwc64YIcYjIDLCSiDaQq
TLSH
T12DD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1184-18-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1184-19-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1544-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/1544-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4756-11-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4756-15-0x0000000000400000-0x0000000000436000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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