juko | 7abeaa47ba6d6168a062956bd622755476488f824d4a92a554b4cd5139ec2c2e

General

Target
2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe
Size 39KB
Sample260731-pc72naac24
SHA256 7abeaa47ba6d6168a062956bd622755476488f824d4a92a554b4cd5139ec2c2e
MD5 2e3ce0130b6f4d9d5132f81c28530bd3
SHA1 dd3e26ec9215d44ab9c510816cf436095d36ebe1
SHA512 ccc6345fec78c83ca7b52d55991ac0d43cf32074ddd0788c87f925f129519d2155bb0171d01a87c11f038afcdbaa6e13054195c97e41fc1def819b702465698c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB7:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T1CC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1260-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b000000016907-5.dat	family_juko
behavioral1/memory/816-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1260-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/816-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0013000000024365-16.dat	family_juko
behavioral1/memory/5032-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/5032-19-0x0000000000400000-0x000000000041D000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
816	WINWORD.exe
5032	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-1-5-21-540052884-2969440504-464782435-1000\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
3320	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	2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_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
1328	PING.EXE
616	PING.EXE
3320	cmd.exe
3776	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3776	PING.EXE
1328	PING.EXE
616	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1260 wrote to memory of 816	1260	2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe	86
PID 816 wrote to memory of 3320	816	WINWORD.exe	87
PID 3320 wrote to memory of 3776	3320	cmd.exe	89
PID 3320 wrote to memory of 1328	3320	cmd.exe	90
PID 3320 wrote to memory of 616	3320	cmd.exe	91
PID 3320 wrote to memory of 5032	3320	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-31_2e3ce0130b6f4d9d5132f81c28530bd3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1260
- 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:816
- - 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\00001848" 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:3320
  - - 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:3776
  - - 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:1328
  - - 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:616
  - - 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:5032

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

00001848

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001848
Size 39KB
SHA256 31699c444b2e040e5728900443fa1221315f7687592d51d8f9606e671897088e
MD5 da6042be1e0ef237fe25b902061d511f
SHA1 1bf1c70208a4af425746976e2632be8bd6c5cf11
SHA512 7070d7f6893ffcbdaa1ce6ba7e1f5a7b8a4f97064c14dfbee34b4632851b95eedc1930fcc0d3ba4e8fe458ef372e1e4e70cf1a4ace11d3bc5019fde517e57a9a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBB:aLsF2Kerc64sTiX2IV0DVyIGFK
TLSH
T1DD035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 7abeaa47ba6d6168a062956bd622755476488f824d4a92a554b4cd5139ec2c2e
MD5 2e3ce0130b6f4d9d5132f81c28530bd3
SHA1 dd3e26ec9215d44ab9c510816cf436095d36ebe1
SHA512 ccc6345fec78c83ca7b52d55991ac0d43cf32074ddd0788c87f925f129519d2155bb0171d01a87c11f038afcdbaa6e13054195c97e41fc1def819b702465698c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB7:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T1CC036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/816-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/816-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1260-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1260-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5032-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5032-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads