juko | f207109db4c4ce87d9f64b33867afc34d46b7d6c07401c24df5e54dc781748e9

General

Target
2026-07-06_5e2d543f6700e82eb66016fd494cea94_elex_wannacry.exe
Size 37KB
Sample260706-wtcemsez3n
SHA256 f207109db4c4ce87d9f64b33867afc34d46b7d6c07401c24df5e54dc781748e9
MD5 5e2d543f6700e82eb66016fd494cea94
SHA1 61c9071712b95ca10a79dad54a574231fcfa60ef
SHA512 db4ee912610d0164e521e592de7a33fd625afdaeb158c7527019cc8f8f6a4cb695c6e667400f5e1a0a77f0b24b32db3d3dd337e00192ce01594f464ef1f84cc0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaN:3LsF2Kerc64sTiX2IV0Dhuogwm
TLSH
T139035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/5332-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000700000001b850-5.dat	family_juko
behavioral2/memory/5332-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5204-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001100000001c503-13.dat	family_juko
behavioral2/memory/6036-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6036-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5204	WINWORD.exe
6036	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-1-5-21-3865087520-2734723108-1233268525-1000\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

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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-06_5e2d543f6700e82eb66016fd494cea94_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

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
3544	PING.EXE
5272	PING.EXE
6088	PING.EXE
2604	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3544	PING.EXE
5272	PING.EXE
6088	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5332 wrote to memory of 5204	5332	2026-07-06_5e2d543f6700e82eb66016fd494cea94_elex_wannacry.exe	89
PID 5204 wrote to memory of 2604	5204	WINWORD.exe	90
PID 2604 wrote to memory of 3544	2604	cmd.exe	92
PID 2604 wrote to memory of 5272	2604	cmd.exe	93
PID 2604 wrote to memory of 6088	2604	cmd.exe	94
PID 2604 wrote to memory of 6036	2604	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-06_5e2d543f6700e82eb66016fd494cea94_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-06_5e2d543f6700e82eb66016fd494cea94_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5332
- 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:5204
- - 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\00007019" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2604
  - - 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:3544
  - - 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:5272
  - - 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:6088
  - - 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:6036

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00007019

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007019
Size 37KB
SHA256 123394b564f18d8a2d78bd54be48d0988357174b4a0f1ed62c435f410aaa543a
MD5 0adda759de2d99920a3ba3f518b1cb7c
SHA1 353b75bd6b9ae958ba9f2119d7e2e71cb719e467
SHA512 a15270c9cda74b58a87474c6ba7dd5dd224fc207ae05b225082c746a5942649306f281ae505e7d86aaec7371f75b9852ae997230aea15913a09572dad006748d
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaD:3LsF2Kerc64sTiX2IV0DhuogwA
TLSH
T148035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 f207109db4c4ce87d9f64b33867afc34d46b7d6c07401c24df5e54dc781748e9
MD5 5e2d543f6700e82eb66016fd494cea94
SHA1 61c9071712b95ca10a79dad54a574231fcfa60ef
SHA512 db4ee912610d0164e521e592de7a33fd625afdaeb158c7527019cc8f8f6a4cb695c6e667400f5e1a0a77f0b24b32db3d3dd337e00192ce01594f464ef1f84cc0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaN:3LsF2Kerc64sTiX2IV0Dhuogwm
TLSH
T139035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5204-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5332-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5332-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6036-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6036-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads