juko | 565ad3a46d2acfb86d37dc8571dd6f763c7a637ce5822f47dd8f900a8c48ce71

General

Target
2026-07-14_20fef8a176ad67c671b14a9cffc104f4_elex_wannacry.exe
Size 39KB
Sample260714-kl32vab121
SHA256 565ad3a46d2acfb86d37dc8571dd6f763c7a637ce5822f47dd8f900a8c48ce71
MD5 20fef8a176ad67c671b14a9cffc104f4
SHA1 dcba84f80406f96e02119ef0c331f27fd9317c53
SHA512 ca0e8ac98f34ce8cd66462194d87ee1a0bb42be4481999a60fa60d708b90ecf21d1cb1a677a8b7490033761b9eb6d9f87f97483c4637466bc943f95fcd5f91a8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBn:aLsF2Kerc64sTiX2IV0DVyIGF0
TLSH
T1F1036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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
behavioral2/memory/4308-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e000000019cd9-5.dat	family_juko
behavioral2/memory/4440-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4308-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4440-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5ca-14.dat	family_juko
behavioral2/memory/5532-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5532-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4440	WINWORD.exe
5532	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-1-5-21-552508041-2681165170-3229858294-1000\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	2026-07-14_20fef8a176ad67c671b14a9cffc104f4_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
3520	cmd.exe
4380	PING.EXE
2568	PING.EXE
5368	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4380	PING.EXE
2568	PING.EXE
5368	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4308 wrote to memory of 4440	4308	2026-07-14_20fef8a176ad67c671b14a9cffc104f4_elex_wannacry.exe	88
PID 4440 wrote to memory of 3520	4440	WINWORD.exe	89
PID 3520 wrote to memory of 4380	3520	cmd.exe	91
PID 3520 wrote to memory of 2568	3520	cmd.exe	92
PID 3520 wrote to memory of 5368	3520	cmd.exe	93
PID 3520 wrote to memory of 5532	3520	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-14_20fef8a176ad67c671b14a9cffc104f4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-14_20fef8a176ad67c671b14a9cffc104f4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4308
- 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:4440
- - 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\00005170" 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:3520
  - - 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:4380
  - - 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:2568
  - - 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:5368
  - - 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:5532

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

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

00005170

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005170
Size 39KB
SHA256 148f021c7661284d616ed3ec0e7c2ea384b54bdb8b499d0b0729fe5d6d84c67f
MD5 bbe0e73a3711157670d17e6e68b7d88c
SHA1 0c5497964d2d9a3e197dc701fbeb6b1c46b6fb4c
SHA512 fe7c0a2438076164685ec24c44873ee73fc2714d7a4ce17ea508c98332657566b545d20213046c6c507f1adb2def91f84ad13f2b79f4cd69006ed28d6592fe47
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBw:aLsF2Kerc64sTiX2IV0DVyIGF/
TLSH
T1E5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 565ad3a46d2acfb86d37dc8571dd6f763c7a637ce5822f47dd8f900a8c48ce71
MD5 20fef8a176ad67c671b14a9cffc104f4
SHA1 dcba84f80406f96e02119ef0c331f27fd9317c53
SHA512 ca0e8ac98f34ce8cd66462194d87ee1a0bb42be4481999a60fa60d708b90ecf21d1cb1a677a8b7490033761b9eb6d9f87f97483c4637466bc943f95fcd5f91a8
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBn:aLsF2Kerc64sTiX2IV0DVyIGF0
TLSH
T1F1036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4308-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4308-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4440-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4440-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5532-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5532-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads