juko | 42b0ca6b3dd0b457db06ed63cb9c439a70e3fb63b31eba2a50716f264c13499b

General

Target
2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe
Size 49KB
Sample260809-esmesazerg
SHA256 42b0ca6b3dd0b457db06ed63cb9c439a70e3fb63b31eba2a50716f264c13499b
MD5 2c48a0af14f12b5ff235dad3611e0aa2
SHA1 9a5210ecbe913dad9e3fbcb04cb780163924e15f
SHA512 b60a319075b4220ae8452a5714006ad91ceb2cd1d2fa5f66050842d2eab43e608dab4a880ca2ba814752e090bed3e6d0c791b34e08e9138b505c62a1d91c91e6
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2A:VLy2Kerc64CiGImVucp4kojWh2A
TLSH
T192334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/2984-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00050000000232a4-5.dat	family_juko
behavioral1/memory/860-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2984-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/860-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00030000000232ba-16.dat	family_juko
behavioral1/memory/5776-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5776-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
860	WINWORD.exe
5776	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-1-5-21-3053180483-1881419501-3594244048-1000\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
4516	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	2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_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
4516	cmd.exe
5624	PING.EXE
2616	PING.EXE
5704	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5624	PING.EXE
2616	PING.EXE
5704	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2984 wrote to memory of 860	2984	2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe	86
PID 860 wrote to memory of 4516	860	WINWORD.exe	87
PID 4516 wrote to memory of 5624	4516	cmd.exe	89
PID 4516 wrote to memory of 2616	4516	cmd.exe	90
PID 4516 wrote to memory of 5704	4516	cmd.exe	92
PID 4516 wrote to memory of 5776	4516	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_2c48a0af14f12b5ff235dad3611e0aa2_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2984
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:860
- - 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\00007C88" 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:4516
  - - 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:5624
  - - 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:2616
  - - 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:5704
  - - 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:5776

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00007C88

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007C88
Size 49KB
SHA256 f14faa21f22f98bee04b950097e5f2d1466706f102eb4b65e67521e1a09cc74b
MD5 abb724e69e07b98f48eead5beab566d1
SHA1 e86fa4007719c90134836633a293a465623d67bd
SHA512 1ae146db7824e3e7b7bd552bec1816baea25df2cc9bf118cdd92f55cf504c6466980e7af2c537f56b463e1bef2aa17d923ca69c45b8323daa06a9b5273868ffd
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Z:VLy2Kerc64CiGImVucp4kojWh2Z
TLSH
T140334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 42b0ca6b3dd0b457db06ed63cb9c439a70e3fb63b31eba2a50716f264c13499b
MD5 2c48a0af14f12b5ff235dad3611e0aa2
SHA1 9a5210ecbe913dad9e3fbcb04cb780163924e15f
SHA512 b60a319075b4220ae8452a5714006ad91ceb2cd1d2fa5f66050842d2eab43e608dab4a880ca2ba814752e090bed3e6d0c791b34e08e9138b505c62a1d91c91e6
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2A:VLy2Kerc64CiGImVucp4kojWh2A
TLSH
T192334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/860-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/860-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2984-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2984-13-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5776-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5776-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads