juko | 52b799b73248474522a958360d11725fb29b58d2e6b9583401317c48a7f6a283

General

Target
2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe
Size 37KB
Sample260802-egh8zssyaz
SHA256 52b799b73248474522a958360d11725fb29b58d2e6b9583401317c48a7f6a283
MD5 d7027ce8916d9d082670da90e0c321be
SHA1 5a2e4b527ec6a809a4ecc3ebe8720f578e18f9fb
SHA512 7933b6607ebf5b2808ea71bed23efc5d7fce4ff0e8236b9787d01e6c9241b557169015a7783d19a2bb65f1d76abc05b53135c06b50eb65e44ae767c58d2e8b74
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogw1
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/1192-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00270000000243cc-5.dat	family_juko
behavioral1/memory/1132-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1192-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1132-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0008000000024594-16.dat	family_juko
behavioral1/memory/3392-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3392-19-0x0000000000400000-0x000000000041D000-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	2026-08-01_d7027ce8916d9d082670da90e0c321be_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
1132	WINWORD.exe
3392	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
3820	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.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
5052	PING.EXE
4476	PING.EXE
3184	PING.EXE
3820	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5052	PING.EXE
4476	PING.EXE
3184	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1192 wrote to memory of 1132	1192	2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe	84
PID 1132 wrote to memory of 3820	1132	WINWORD.exe	85
PID 3820 wrote to memory of 5052	3820	cmd.exe	87
PID 3820 wrote to memory of 4476	3820	cmd.exe	88
PID 3820 wrote to memory of 3184	3820	cmd.exe	91
PID 3820 wrote to memory of 3392	3820	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1192
- 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:1132
- - 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\00006C62" 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:3820
  - - 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:5052
  - - 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:4476
  - - 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:3184
  - - 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:3392

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

00006C62

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006C62
Size 37KB
SHA256 959f9726b3ffcea8cc3ec966d2f8caafce7b5ef6302ecc85812a57138d0d9503
MD5 759bc8944b5ac9fe3f81d9fcbbdcf4c6
SHA1 1ea8af954d7c054377305e9b6a01054aee118341
SHA512 c837dddaae6827d19eb091b3bcb1dfbcaa0b915ecd5af23eda260d58061cc7fe0a6e744adef4f35783eeedfa9baccf5e5d9ae1ded86b0da1f85af2f932c45d7e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaC:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T1CC034C1A299160A2D55310B0E9D81FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 52b799b73248474522a958360d11725fb29b58d2e6b9583401317c48a7f6a283
MD5 d7027ce8916d9d082670da90e0c321be
SHA1 5a2e4b527ec6a809a4ecc3ebe8720f578e18f9fb
SHA512 7933b6607ebf5b2808ea71bed23efc5d7fce4ff0e8236b9787d01e6c9241b557169015a7783d19a2bb65f1d76abc05b53135c06b50eb65e44ae767c58d2e8b74
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogw1
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1132-12-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/1132-15-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/1192-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/1192-13-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/3392-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3392-19-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads