juko | cfcabda08bee013248b5a6b0b8d3e42b9cf798d7a65088c014cfad8f95a1d008

General

Target
2026-07-23_0e25fa6fe3ff9c0a4c0ed88f163f95a8_elex_wannacry.exe
Size 39KB
Sample260723-telnnazzct
SHA256 cfcabda08bee013248b5a6b0b8d3e42b9cf798d7a65088c014cfad8f95a1d008
MD5 0e25fa6fe3ff9c0a4c0ed88f163f95a8
SHA1 dc7bc7b114d27f1249da7648a71335f6b6d61c82
SHA512 ae9f78bed9eee673be43cd41eab50c1723189eec6a865b5c6a9a966500ee14cd07b073251b41447bd1034dd0d624a1f2a1c9acb403ea690e7b92babc3184fc85
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T191036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3124-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e000000016cdc-5.dat	family_juko
behavioral2/memory/3124-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/824-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001000000001c535-13.dat	family_juko
behavioral2/memory/1988-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1988-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
824	WINWORD.exe
1988	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-1-5-21-552508041-2681165170-3229858294-1000\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
3216	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	2026-07-23_0e25fa6fe3ff9c0a4c0ed88f163f95a8_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
3216	cmd.exe
1920	PING.EXE
4568	PING.EXE
3808	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1920	PING.EXE
4568	PING.EXE
3808	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3124 wrote to memory of 824	3124	2026-07-23_0e25fa6fe3ff9c0a4c0ed88f163f95a8_elex_wannacry.exe	89
PID 824 wrote to memory of 3216	824	WINWORD.exe	90
PID 3216 wrote to memory of 1920	3216	cmd.exe	92
PID 3216 wrote to memory of 4568	3216	cmd.exe	93
PID 3216 wrote to memory of 3808	3216	cmd.exe	94
PID 3216 wrote to memory of 1988	3216	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-23_0e25fa6fe3ff9c0a4c0ed88f163f95a8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_0e25fa6fe3ff9c0a4c0ed88f163f95a8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3124
- 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:824
- - 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\00005F07" 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:3216
  - - 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:1920
  - - 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:4568
  - - 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:3808
  - - 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:1988

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

00005F07

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005F07
Size 39KB
SHA256 5184d3485331159f3f94cc4363e5119bc2b70ae73ebc6010be69b8847618af40
MD5 c5602d8115e34fb63b4fd100be5e3e4e
SHA1 5f14e17fd9dcff8e00d5108aeade6ea4a9f09e08
SHA512 ec3e62d87ebfbcd23343f7df71034b85f06804194f90f89bfb5e989fcbe8f76a6a5d65236432720eba3b173d95581fa0dc1e9107ea9900acc0e989418c051dae
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBK:aLsF2Kerc64sTiX2IV0DVyIGF1
TLSH
T1A0036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 cfcabda08bee013248b5a6b0b8d3e42b9cf798d7a65088c014cfad8f95a1d008
MD5 0e25fa6fe3ff9c0a4c0ed88f163f95a8
SHA1 dc7bc7b114d27f1249da7648a71335f6b6d61c82
SHA512 ae9f78bed9eee673be43cd41eab50c1723189eec6a865b5c6a9a966500ee14cd07b073251b41447bd1034dd0d624a1f2a1c9acb403ea690e7b92babc3184fc85
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBU:aLsF2Kerc64sTiX2IV0DVyIGFL
TLSH
T191036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/824-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1988-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1988-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3124-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3124-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads