juko | 0363b73ef863be17a9cf009093d39876a0dded5cd3deec947c70d707462c5a7c

General

Target
2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe
Size 39KB
Sample260730-pry3ashf89
SHA256 0363b73ef863be17a9cf009093d39876a0dded5cd3deec947c70d707462c5a7c
MD5 0021886d8adb6e3f31fa022f3a831128
SHA1 d510cfda38b21b71cb2b5e326cab1757849b22c0
SHA512 96657fdd83c62bd0a71c17a4dcbd3c213959feb457835a415712327de532ae76a994e285b1e72b0d0c583b3d0d6c6f889854632b0d3e83ad6ff5de063a2fb1a4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB6:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1D5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
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/3356-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0005000000023208-5.dat	family_juko
behavioral1/memory/3356-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2928-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00060000000006d1-15.dat	family_juko
behavioral1/memory/4720-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4720-18-0x0000000000400000-0x000000000041D000-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	2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2928	WINWORD.exe
4720	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
3436	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	2026-07-30_0021886d8adb6e3f31fa022f3a831128_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
3436	cmd.exe
2120	PING.EXE
4604	PING.EXE
3756	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2120	PING.EXE
4604	PING.EXE
3756	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3356 wrote to memory of 2928	3356	2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe	89
PID 2928 wrote to memory of 3436	2928	WINWORD.exe	90
PID 3436 wrote to memory of 2120	3436	cmd.exe	92
PID 3436 wrote to memory of 4604	3436	cmd.exe	93
PID 3436 wrote to memory of 3756	3436	cmd.exe	94
PID 3436 wrote to memory of 4720	3436	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_0021886d8adb6e3f31fa022f3a831128_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3356
- 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:2928
- - 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\00003953" 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:3436
  - - 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:2120
  - - 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:4604
  - - 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:3756
  - - 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:4720

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

00003953

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003953
Size 39KB
SHA256 873f2e965d4f66ca2fb8c43d311ce9273d9ca6553f56a300ee110e485dfc70c0
MD5 49475ba4d28bcfefa47747ece3301bd8
SHA1 438697a766fb06802a2172625517f7536d70867c
SHA512 3d070365616c007f49a647fc492e3d4aec461ef6fde6337d6c9176814288096806d6b21797cc1625961cdd2c43d4895410374e3e396382658ba4501a13344b1c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBF:aLsF2Kerc64sTiX2IV0DVyIGFG
TLSH
T161036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 0363b73ef863be17a9cf009093d39876a0dded5cd3deec947c70d707462c5a7c
MD5 0021886d8adb6e3f31fa022f3a831128
SHA1 d510cfda38b21b71cb2b5e326cab1757849b22c0
SHA512 96657fdd83c62bd0a71c17a4dcbd3c213959feb457835a415712327de532ae76a994e285b1e72b0d0c583b3d0d6c6f889854632b0d3e83ad6ff5de063a2fb1a4
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB6:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1D5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2928-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3356-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3356-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4720-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4720-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads