juko | 6bcc229233a24e27ff36a9fb6b08a3be003e7cae75b18987886dc9ad742ba8a8

General

Target
2026-08-02_3792cbd2cd3e5a1d0025a0781b76c510_elex_wannacry.exe
Size 39KB
Sample260802-1s6pbasfna
SHA256 6bcc229233a24e27ff36a9fb6b08a3be003e7cae75b18987886dc9ad742ba8a8
MD5 3792cbd2cd3e5a1d0025a0781b76c510
SHA1 cc1f89aef84fadeb7c58ab212f0c3e6c66c45ccb
SHA512 be560b34273b52b99563b747b7904e7d99179932b2a343ed3591547c482b4ed16a8edbb95788697c9a4fad134908baf5a4937dd5b7f35326e8efe74e1082f2fc
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBL:aLsF2Kerc64sTiX2IV0DVyIGFU
TLSH
T130036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1596-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0014000000024346-5.dat	family_juko
behavioral1/memory/1596-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4344-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4344-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000800000002450a-16.dat	family_juko
behavioral1/memory/4888-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4888-19-0x0000000000400000-0x000000000041D000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-02_3792cbd2cd3e5a1d0025a0781b76c510_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4344	WINWORD.exe
4888	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-1-5-21-2937465464-4167303362-2236413517-1000\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
4440	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_3792cbd2cd3e5a1d0025a0781b76c510_elex_wannacry.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
4440	cmd.exe
3756	PING.EXE
3404	PING.EXE
3764	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3756	PING.EXE
3404	PING.EXE
3764	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1596 wrote to memory of 4344	1596	2026-08-02_3792cbd2cd3e5a1d0025a0781b76c510_elex_wannacry.exe	85
PID 4344 wrote to memory of 4440	4344	WINWORD.exe	86
PID 4440 wrote to memory of 3756	4440	cmd.exe	88
PID 4440 wrote to memory of 3404	4440	cmd.exe	89
PID 4440 wrote to memory of 3764	4440	cmd.exe	90
PID 4440 wrote to memory of 4888	4440	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-02_3792cbd2cd3e5a1d0025a0781b76c510_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_3792cbd2cd3e5a1d0025a0781b76c510_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1596
- 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:4344
- - 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\00005411" 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:4440
  - - 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:3756
  - - 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:3404
  - - 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:3764
  - - 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:4888

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

00005411

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005411
Size 39KB
SHA256 8b8816e312f16b940645f9e747ab703b3d35871f436f083c583dec1a8393365f
MD5 00beb29d5dd88b88f43655ffb4522097
SHA1 e0c4a7bb1d9221a2ccd8bb222cfcf1fa8ab64679
SHA512 24e65c418eb026a8b2a68ab3a0c0b2a29e5510d3718342c28f907e0805cf98b4771092013db44f02739ef5c4770ff16f84d0baef0275e199dcb6e787ac397c38
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBC:aLsF2Kerc64sTiX2IV0DVyIGFN
TLSH
T171036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 6bcc229233a24e27ff36a9fb6b08a3be003e7cae75b18987886dc9ad742ba8a8
MD5 3792cbd2cd3e5a1d0025a0781b76c510
SHA1 cc1f89aef84fadeb7c58ab212f0c3e6c66c45ccb
SHA512 be560b34273b52b99563b747b7904e7d99179932b2a343ed3591547c482b4ed16a8edbb95788697c9a4fad134908baf5a4937dd5b7f35326e8efe74e1082f2fc
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBL:aLsF2Kerc64sTiX2IV0DVyIGFU
TLSH
T130036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1596-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1596-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4344-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4344-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4888-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4888-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads