juko | 3d49976349456a561997af8863f62d6c0dae4ee8ff28a6652c53e8269b153377

General

Target
2026-09-01_70f465f622faccf00fe5f01aa959d7af_elex_wannacry.exe
Size 39KB
Sample260903-l2dybseq71
SHA256 3d49976349456a561997af8863f62d6c0dae4ee8ff28a6652c53e8269b153377
MD5 70f465f622faccf00fe5f01aa959d7af
SHA1 5d2053f962f2390fc56c59ed2bd095838ff756a2
SHA512 1e05863d096e59cf70d7007514dd2a24b531314c038dd3f2a9255fdbff65a1eb2381819496f5d3493d22234dbdf582cd46addc2ffdac8a46b4a9dfb0220bc5a0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGF3
TLSH
T163036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 8 IoCs

resource	yara_rule
behavioral1/memory/2904-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0020000000024338-5.dat	family_juko
behavioral1/memory/4272-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2904-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4272-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000900000002444b-16.dat	family_juko
behavioral1/memory/5040-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/5040-19-0x0000000000400000-0x000000000041D000-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	2026-09-01_70f465f622faccf00fe5f01aa959d7af_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
4272	WINWORD.exe
5040	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
3168	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-01_70f465f622faccf00fe5f01aa959d7af_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

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
3168	cmd.exe
4476	PING.EXE
3356	PING.EXE
4556	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4476	PING.EXE
3356	PING.EXE
4556	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2904 wrote to memory of 4272	2904	2026-09-01_70f465f622faccf00fe5f01aa959d7af_elex_wannacry.exe	85
PID 4272 wrote to memory of 3168	4272	WINWORD.exe	86
PID 3168 wrote to memory of 4476	3168	cmd.exe	88
PID 3168 wrote to memory of 3356	3168	cmd.exe	89
PID 3168 wrote to memory of 4556	3168	cmd.exe	90
PID 3168 wrote to memory of 5040	3168	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-09-01_70f465f622faccf00fe5f01aa959d7af_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-01_70f465f622faccf00fe5f01aa959d7af_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2904
- 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:4272
- - 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\00001EEF" 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:3168
  - - 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:4476
  - - 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:3356
  - - 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:4556
  - - 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:5040

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

00001EEF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001EEF
Size 39KB
SHA256 3f697b0f2747e303838e791ec210601b1f9d6fc8e47f641a66fcad5940041845
MD5 0117edc97c8b8f943e7d9b38a3351f05
SHA1 5f1812d38459a4fa090ffb4ed862b332d32c7c5b
SHA512 ab5684620456598fdda45e0dc421402647cbb5332547288d2ab06f66b52f24c5c9236733c3dfdfef9b275e0d748107f8fb2864f04be2c8e17debc2905ef53d11
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFc
TLSH
T1E0036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 3d49976349456a561997af8863f62d6c0dae4ee8ff28a6652c53e8269b153377
MD5 70f465f622faccf00fe5f01aa959d7af
SHA1 5d2053f962f2390fc56c59ed2bd095838ff756a2
SHA512 1e05863d096e59cf70d7007514dd2a24b531314c038dd3f2a9255fdbff65a1eb2381819496f5d3493d22234dbdf582cd46addc2ffdac8a46b4a9dfb0220bc5a0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBY:aLsF2Kerc64sTiX2IV0DVyIGF3
TLSH
T163036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2904-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2904-13-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4272-12-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4272-15-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/5040-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5040-19-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads