juko | 10125dd9a0f284408c94ed7fea44e9d65b66e945d0275ca3bf7c0ac058bb6250

General

Target
2026-08-04_bc4774e12b9bdf737b8dd083400f5ba2_elex_wannacry.exe
Size 39KB
Sample260804-w6c7psbr8x
SHA256 10125dd9a0f284408c94ed7fea44e9d65b66e945d0275ca3bf7c0ac058bb6250
MD5 bc4774e12b9bdf737b8dd083400f5ba2
SHA1 d08e6e4e1d0319a47a883fe65fdc1d69cd6b6ec3
SHA512 987750fc0aefc184da0c199ba23f17272451d706bf497df393d5360453f8f0ddab881fa288221a86d9b29cc492b2c825fe7fcf1939eb9e1e636518b824d290b6
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBP:aLsF2Kerc64sTiX2IV0DVyIGFU
TLSH
T1F6035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/556-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001400000001b1d0-5.dat	family_juko
behavioral2/memory/556-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2260-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c551-13.dat	family_juko
behavioral2/memory/4168-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4168-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2260	WINWORD.exe
4168	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
4532	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	2026-08-04_bc4774e12b9bdf737b8dd083400f5ba2_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
3984	PING.EXE
4200	PING.EXE
3428	PING.EXE
4532	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3984	PING.EXE
4200	PING.EXE
3428	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 556 wrote to memory of 2260	556	2026-08-04_bc4774e12b9bdf737b8dd083400f5ba2_elex_wannacry.exe	88
PID 2260 wrote to memory of 4532	2260	WINWORD.exe	89
PID 4532 wrote to memory of 3984	4532	cmd.exe	91
PID 4532 wrote to memory of 4200	4532	cmd.exe	92
PID 4532 wrote to memory of 3428	4532	cmd.exe	93
PID 4532 wrote to memory of 4168	4532	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-04_bc4774e12b9bdf737b8dd083400f5ba2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_bc4774e12b9bdf737b8dd083400f5ba2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:556
- 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:2260
- - 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\00006B30" 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:4532
  - - 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:3984
  - - 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:4200
  - - 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:3428
  - - 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:4168

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

00006B30

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006B30
Size 39KB
SHA256 0edf84233dc91291105dd004d1100f8b28273b7f46cc65a557a3d3bf48d9295d
MD5 a5531f20c572fcecaedd429062c02430
SHA1 4b02e4561d5d3036e34d0730beae3713073b30a0
SHA512 488556f2461c96d1aba92152e7953cba3d5f0e46db5ab2df13fa3f47793b1497eff256322a9c2a7cc859b68bedf78b85cde3c95a2da63fe5f464958b47b1dd7c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBI:aLsF2Kerc64sTiX2IV0DVyIGFn
TLSH
T109036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 10125dd9a0f284408c94ed7fea44e9d65b66e945d0275ca3bf7c0ac058bb6250
MD5 bc4774e12b9bdf737b8dd083400f5ba2
SHA1 d08e6e4e1d0319a47a883fe65fdc1d69cd6b6ec3
SHA512 987750fc0aefc184da0c199ba23f17272451d706bf497df393d5360453f8f0ddab881fa288221a86d9b29cc492b2c825fe7fcf1939eb9e1e636518b824d290b6
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBP:aLsF2Kerc64sTiX2IV0DVyIGFU
TLSH
T1F6035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/556-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/556-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2260-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4168-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4168-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads