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 7 IoCs

resource	yara_rule
behavioral2/memory/2624-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cc9-5.dat	family_juko
behavioral2/memory/2624-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6124-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c52a-13.dat	family_juko
behavioral2/memory/3208-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3208-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6124	WINWORD.exe
3208	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-1-5-21-1738198120-2966725515-3980530802-1000\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
1164	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	2026-09-01_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
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
1164	cmd.exe
4664	PING.EXE
1948	PING.EXE
2916	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2916	PING.EXE
4664	PING.EXE
1948	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2624 wrote to memory of 6124	2624	2026-09-01_70f465f622faccf00fe5f01aa959d7af_elex_wannacry.exe	89
PID 6124 wrote to memory of 1164	6124	WINWORD.exe	90
PID 1164 wrote to memory of 4664	1164	cmd.exe	92
PID 1164 wrote to memory of 1948	1164	cmd.exe	93
PID 1164 wrote to memory of 2916	1164	cmd.exe	94
PID 1164 wrote to memory of 3208	1164	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2624
- 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:6124
- - 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\0000276C" 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:1164
  - - 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:4664
  - - 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:1948
  - - 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:2916
  - - 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:3208

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

0000276C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000276C
Size 39KB
SHA256 bf5f2b6762e293247473b36cce1cc35d3eb491b12f8a3ce2609b0c4255f3c432
MD5 1d26ce68c4ecb5f82ebda265c1935c76
SHA1 351d4c8069ad462db9b72757a71bfb0e0fde3b46
SHA512 c65776afdcb0039ab389649745df2b324e88d810f55535606b8e4c548f02b176eb181b51cbaa23d1669b0d503072a6b168ddd6545bfe9dd8e03c65570da313cd
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGF7
TLSH
T1B5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/2624-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2624-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3208-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3208-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6124-12-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads