juko | f5a1ae8766c1da76f293fac2d6db13ec8c5a78c8559867b2a038a1706616813e

General

Target
2026-08-13_ae2e3383ce7309b889bc0f967e78c6a9_elex_wannacry.exe
Size 39KB
Sample260813-sct2ksbf53
SHA256 f5a1ae8766c1da76f293fac2d6db13ec8c5a78c8559867b2a038a1706616813e
MD5 ae2e3383ce7309b889bc0f967e78c6a9
SHA1 3adb8a8aec28ab35b016e31ede3b6883f8372f45
SHA512 a9aac56c9c688b873a1082f506bff2b31ade3d68d33ca5c4109e3c655e8abc2b7515ba9bc54e03c5bbce9f7923b42516e57364d9174a6a4a4152f15a12657c38
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFc
TLSH
T11E036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/4052-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0009000000024545-5.dat	family_juko
behavioral1/memory/4052-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4448-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0008000000024546-15.dat	family_juko
behavioral1/memory/1344-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1344-18-0x0000000000400000-0x000000000041D000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-13_ae2e3383ce7309b889bc0f967e78c6a9_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4448	WINWORD.exe
1344	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-1-5-21-2937465464-4167303362-2236413517-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2476	cmd.exe

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-13_ae2e3383ce7309b889bc0f967e78c6a9_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

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
4180	PING.EXE
4524	PING.EXE
2476	cmd.exe
3244	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3244	PING.EXE
4180	PING.EXE
4524	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4052 wrote to memory of 4448	4052	2026-08-13_ae2e3383ce7309b889bc0f967e78c6a9_elex_wannacry.exe	86
PID 4448 wrote to memory of 2476	4448	WINWORD.exe	89
PID 2476 wrote to memory of 3244	2476	cmd.exe	92
PID 2476 wrote to memory of 4180	2476	cmd.exe	93
PID 2476 wrote to memory of 4524	2476	cmd.exe	94
PID 2476 wrote to memory of 1344	2476	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-13_ae2e3383ce7309b889bc0f967e78c6a9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_ae2e3383ce7309b889bc0f967e78c6a9_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4052
- 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:4448
- - 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\00002CF7" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2476
  - - 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:3244
  - - 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:4180
  - - 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:4524
  - - 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:1344

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

00002CF7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002CF7
Size 39KB
SHA256 97d867b723ba825279e31ebb1d230fa30d774e9d823f7b0aaf242b79b86d99fe
MD5 f3f33650106ce7f6901de58b922474eb
SHA1 fb9cb1e8d4b7314353ff82b4b9d06f8784a465d1
SHA512 0fcf603958a86a4de167f4a2f26cad1bfa501ba677ed9863a8041fe3e0a51c1820cc4754396f5a998c25b5318bfee4388c6a212490f34f4379011b8552ae8bac
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBv:aLsF2Kerc64sTiX2IV0DVyIGF0
TLSH
T19B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 f5a1ae8766c1da76f293fac2d6db13ec8c5a78c8559867b2a038a1706616813e
MD5 ae2e3383ce7309b889bc0f967e78c6a9
SHA1 3adb8a8aec28ab35b016e31ede3b6883f8372f45
SHA512 a9aac56c9c688b873a1082f506bff2b31ade3d68d33ca5c4109e3c655e8abc2b7515ba9bc54e03c5bbce9f7923b42516e57364d9174a6a4a4152f15a12657c38
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFc
TLSH
T11E036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1344-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1344-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4052-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4052-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4448-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads