juko | 73f63aac396de2ead6891e258fe896abb075657ec41d31a4606192c50682708e

General

Target
2026-07-19_e7276b5b96a5a35057d4a266124e19d6_elex_wannacry.exe
Size 39KB
Sample260719-djdkvads4v
SHA256 73f63aac396de2ead6891e258fe896abb075657ec41d31a4606192c50682708e
MD5 e7276b5b96a5a35057d4a266124e19d6
SHA1 721cd07944f9bc9bb2d32478140b1b6e26a6aaae
SHA512 4c6618dd2ad83d96647458ea8a9f2e7dea8686139155abdf1a6c776d3f1ab9e95239bf4793f66529c4b0bf82a38ca88aa9cd62ca294e8c3a3a3221cc0e3a3906
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBx:aLsF2Kerc64sTiX2IV0DVyIGF2
TLSH
T12B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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
behavioral2/memory/5832-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000a000000011380-5.dat	family_juko
behavioral2/memory/5832-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3328-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c40c-13.dat	family_juko
behavioral2/memory/4600-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4600-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3328	WINWORD.exe
4600	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-1-5-21-2246396966-3025826688-3847171515-1000\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
900	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	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	2026-07-19_e7276b5b96a5a35057d4a266124e19d6_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

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
900	cmd.exe
4960	PING.EXE
4956	PING.EXE
5044	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4960	PING.EXE
4956	PING.EXE
5044	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5832 wrote to memory of 3328	5832	2026-07-19_e7276b5b96a5a35057d4a266124e19d6_elex_wannacry.exe	89
PID 3328 wrote to memory of 900	3328	WINWORD.exe	90
PID 900 wrote to memory of 4960	900	cmd.exe	92
PID 900 wrote to memory of 4956	900	cmd.exe	93
PID 900 wrote to memory of 5044	900	cmd.exe	94
PID 900 wrote to memory of 4600	900	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-19_e7276b5b96a5a35057d4a266124e19d6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-19_e7276b5b96a5a35057d4a266124e19d6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5832
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3328
- - 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\00003620" 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:900
  - - 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:4960
  - - 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:4956
  - - 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:5044
  - - 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:4600

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00003620

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003620
Size 39KB
SHA256 692196e40c67d038814c98eaaea060939f5dd79aaf16400958f0432acd99686f
MD5 8c416e7005e2575bc2d23c326dd3ad4d
SHA1 7256ccdf370978ab321e70bf97d35c3e47e918e6
SHA512 8ae29b609e90d5c49c0e5c6f43ca19d426c4add809f8e459548f49f6bbac2c248f54f039dff10a7ea12574ba4edf97c1113818d01dbe3a630088d1f2f00b276b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFb
TLSH
T1CE036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 73f63aac396de2ead6891e258fe896abb075657ec41d31a4606192c50682708e
MD5 e7276b5b96a5a35057d4a266124e19d6
SHA1 721cd07944f9bc9bb2d32478140b1b6e26a6aaae
SHA512 4c6618dd2ad83d96647458ea8a9f2e7dea8686139155abdf1a6c776d3f1ab9e95239bf4793f66529c4b0bf82a38ca88aa9cd62ca294e8c3a3a3221cc0e3a3906
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBx:aLsF2Kerc64sTiX2IV0DVyIGF2
TLSH
T12B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3328-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4600-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4600-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5832-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5832-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads