juko | 1685736f8498d1dca40e66ceb6b214731d4f25a7b246181002a6f6067b102d74

General

Target
2026-07-20_f49c43ab5c7c72e4f40da72a3d8fe2d2_elex_wannacry.exe
Size 39KB
Sample260720-rb57sact3m
SHA256 1685736f8498d1dca40e66ceb6b214731d4f25a7b246181002a6f6067b102d74
MD5 f49c43ab5c7c72e4f40da72a3d8fe2d2
SHA1 af64773f5eb3880babc4f93b3aec2a2e634ab191
SHA512 4520356adc1f2399f660c0ce30ed5261376d4aa12bf413e742880df9de217911f34b0392c435c11c0ab083370495e280cfec8260b82bd04841e7ae302569cf2e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBc:aLsF2Kerc64sTiX2IV0DVyIGF/
TLSH
T182036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1760-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00080000000231e6-5.dat	family_juko
behavioral1/memory/1760-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4744-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0009000000024479-15.dat	family_juko
behavioral1/memory/4548-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4548-18-0x0000000000400000-0x000000000041D000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-07-20_f49c43ab5c7c72e4f40da72a3d8fe2d2_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4744	WINWORD.exe
4548	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-1-5-21-540052884-2969440504-464782435-1000\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
4956	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-20_f49c43ab5c7c72e4f40da72a3d8fe2d2_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

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
2320	PING.EXE
2356	PING.EXE
4956	cmd.exe
3776	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3776	PING.EXE
2320	PING.EXE
2356	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1760 wrote to memory of 4744	1760	2026-07-20_f49c43ab5c7c72e4f40da72a3d8fe2d2_elex_wannacry.exe	83
PID 4744 wrote to memory of 4956	4744	WINWORD.exe	84
PID 4956 wrote to memory of 3776	4956	cmd.exe	86
PID 4956 wrote to memory of 2320	4956	cmd.exe	87
PID 4956 wrote to memory of 2356	4956	cmd.exe	88
PID 4956 wrote to memory of 4548	4956	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-07-20_f49c43ab5c7c72e4f40da72a3d8fe2d2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_f49c43ab5c7c72e4f40da72a3d8fe2d2_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1760
- 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:4744
- - 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\00000A2A" 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: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:3776
  - - 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:2320
  - - 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:2356
  - - 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:4548

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

00000A2A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000A2A
Size 39KB
SHA256 235e78175bf1c4859eb59d78b41118540aa1777b90f3ba003bc40cc167dadad1
MD5 65171839c7f500bb7fd652364c69c25a
SHA1 f794448a6ebb459bbe7d9d1035c21b19e41c2d89
SHA512 94d39e020b4dadd45b91f01a2182e44039548f34270c697d7a07ab17c9e475cb0a26c1eae431d807d8e49f92f6bf70daad4fb21bd1f3bc0a11588393878d549e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBr:aLsF2Kerc64sTiX2IV0DVyIGFE
TLSH
T162036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 1685736f8498d1dca40e66ceb6b214731d4f25a7b246181002a6f6067b102d74
MD5 f49c43ab5c7c72e4f40da72a3d8fe2d2
SHA1 af64773f5eb3880babc4f93b3aec2a2e634ab191
SHA512 4520356adc1f2399f660c0ce30ed5261376d4aa12bf413e742880df9de217911f34b0392c435c11c0ab083370495e280cfec8260b82bd04841e7ae302569cf2e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBc:aLsF2Kerc64sTiX2IV0DVyIGF/
TLSH
T182036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1760-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1760-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4548-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4548-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4744-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads