juko | 266f38cd9bc130b4296f0b590475349a2f757783da66fa45a949496dc01d17fa

General

Target
2026-09-04_bf33916ad78cd62999bfe340c08f67c2_elex_wannacry.exe
Size 39KB
Sample260904-2p2fvsar7z
SHA256 266f38cd9bc130b4296f0b590475349a2f757783da66fa45a949496dc01d17fa
MD5 bf33916ad78cd62999bfe340c08f67c2
SHA1 826e4b291c34e7e118d18497779ae04baf1da4d4
SHA512 8f03de710344d5608ed159ada1ea6c38913db5a790965894757fd33fe7636a8836933acd0c140c2cb0134148aac97223023587b8700c274c6934b4d7c08a5129
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBu:aLsF2Kerc64sTiX2IV0DVyIGF5
TLSH
T17B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1216-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000800000001b811-4.dat	family_juko
behavioral2/memory/1216-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3556-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001800000001c43b-13.dat	family_juko
behavioral2/memory/2188-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2188-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3556	WINWORD.exe
2188	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-1-5-21-189034102-168398478-1159367937-1000\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
4832	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	2026-09-04_bf33916ad78cd62999bfe340c08f67c2_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
3108	PING.EXE
3748	PING.EXE
2784	PING.EXE
4832	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3108	PING.EXE
3748	PING.EXE
2784	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1216 wrote to memory of 3556	1216	2026-09-04_bf33916ad78cd62999bfe340c08f67c2_elex_wannacry.exe	90
PID 3556 wrote to memory of 4832	3556	WINWORD.exe	91
PID 4832 wrote to memory of 3108	4832	cmd.exe	93
PID 4832 wrote to memory of 3748	4832	cmd.exe	94
PID 4832 wrote to memory of 2784	4832	cmd.exe	95
PID 4832 wrote to memory of 2188	4832	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-09-04_bf33916ad78cd62999bfe340c08f67c2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_bf33916ad78cd62999bfe340c08f67c2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1216
- 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:3556
- - 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\00001A11" 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:4832
  - - 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:3108
  - - 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:3748
  - - 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:2784
  - - 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:2188

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

00001A11

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001A11
Size 39KB
SHA256 43db2423b0052dbfc53d255effa474a2fe2052daae7d53fc0580035e04f138e3
MD5 77debae137f0023ebfb7dc4dee5fd69e
SHA1 bd684228a0e621cf419a64e8aded70fbcb5de1df
SHA512 92ca057b631a3b8beb7df613e0adadef5dbddfbbc436ef454d0a185221521d872bb3f8ee1d77f7d34680f19c898e19c9c1aea48c17a2aa4851d748d33cbd163f
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBd:aLsF2Kerc64sTiX2IV0DVyIGFG
TLSH
T1B5036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 266f38cd9bc130b4296f0b590475349a2f757783da66fa45a949496dc01d17fa
MD5 bf33916ad78cd62999bfe340c08f67c2
SHA1 826e4b291c34e7e118d18497779ae04baf1da4d4
SHA512 8f03de710344d5608ed159ada1ea6c38913db5a790965894757fd33fe7636a8836933acd0c140c2cb0134148aac97223023587b8700c274c6934b4d7c08a5129
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBu:aLsF2Kerc64sTiX2IV0DVyIGF5
TLSH
T17B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1216-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1216-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2188-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2188-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3556-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads