juko | 5d8f9d61d321d7baceef3307465d7d31706c11c3ba18d4e3ef34f92156f0610b

General

Target
2026-07-21_4598bdf8e8cf372f3a121dcd3c7f989a_elex_wannacry.exe
Size 37KB
Sample260721-2epdjsam7t
SHA256 5d8f9d61d321d7baceef3307465d7d31706c11c3ba18d4e3ef34f92156f0610b
MD5 4598bdf8e8cf372f3a121dcd3c7f989a
SHA1 13353e5432ce86b0b0be4ccbd99e725839de8581
SHA512 a5c16a842e49c1cee9a07fc4ea90073821a63c0966c48f49737f0cf5f096e3778d4e91911e0873ae84b22cad046e26fc190cd23234b0eee4beb1d8bf38cc1800
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaF:3LsF2Kerc64sTiX2IV0DhuogwW
TLSH
T192035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/4880-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b3a-5.dat	family_juko
behavioral2/memory/4880-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4332-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001400000001c512-13.dat	family_juko
behavioral2/memory/2728-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2728-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4332	WINWORD.exe
2728	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-1-5-21-3797332335-34111092-3597280141-1000\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
8	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	2026-07-21_4598bdf8e8cf372f3a121dcd3c7f989a_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
8	cmd.exe
1300	PING.EXE
3844	PING.EXE
4116	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3844	PING.EXE
4116	PING.EXE
1300	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4880 wrote to memory of 4332	4880	2026-07-21_4598bdf8e8cf372f3a121dcd3c7f989a_elex_wannacry.exe	89
PID 4332 wrote to memory of 8	4332	WINWORD.exe	90
PID 8 wrote to memory of 1300	8	cmd.exe	92
PID 8 wrote to memory of 3844	8	cmd.exe	93
PID 8 wrote to memory of 4116	8	cmd.exe	94
PID 8 wrote to memory of 2728	8	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-21_4598bdf8e8cf372f3a121dcd3c7f989a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-21_4598bdf8e8cf372f3a121dcd3c7f989a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4880
- 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:4332
- - 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\00002E7A" 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:8
  - - 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:1300
  - - 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:3844
  - - 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:4116
  - - 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:2728

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

00002E7A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E7A
Size 37KB
SHA256 92f14a53baa5905b180d62ebbb0b6a4e1367bc98988941fa1d886ddbeb51a856
MD5 3f1149447e4b6adc49c218fe7c2a698a
SHA1 47385b9031d5ec311abd0ba0ee18d8592477302b
SHA512 4cd7eb7e693e69859d127b2f23d443d420e674b404c75915631c8b1e10499584e88252fd9c48fc28f453d53790350cbc2df01cd553f2bfecdf815008cb4d6100
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaF:3LsF2Kerc64sTiX2IV0DhuogwS
TLSH
T148035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 5d8f9d61d321d7baceef3307465d7d31706c11c3ba18d4e3ef34f92156f0610b
MD5 4598bdf8e8cf372f3a121dcd3c7f989a
SHA1 13353e5432ce86b0b0be4ccbd99e725839de8581
SHA512 a5c16a842e49c1cee9a07fc4ea90073821a63c0966c48f49737f0cf5f096e3778d4e91911e0873ae84b22cad046e26fc190cd23234b0eee4beb1d8bf38cc1800
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaF:3LsF2Kerc64sTiX2IV0DhuogwW
TLSH
T192035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2728-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2728-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4332-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4880-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4880-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads