juko | 8e15caaffe21a771c11190bd8e8f3fe7963c5f9349e346d355d99f01fc8fac34

General

Target
2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe
Size 39KB
Sample260802-a6frya1cpg
SHA256 8e15caaffe21a771c11190bd8e8f3fe7963c5f9349e346d355d99f01fc8fac34
MD5 4b340d05773eb8ef0da8377b53686eaf
SHA1 7e81a6e19b93b77cf0a2702a4d64f7bbb978dcb4
SHA512 ec42d8cd5641f64a51f84b5561dbc0690cb2253f733bc082407cad92d7c33e9c9eb515d058a789ba2c2f25a1e01d2065beaf73077b4cc47d1d9e51c12d120f8b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBM:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T11C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1224-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b0000000241e7-5.dat	family_juko
behavioral1/memory/3488-11-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1224-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3488-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0009000000024309-16.dat	family_juko
behavioral1/memory/212-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/212-19-0x0000000000400000-0x000000000041D000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3488	WINWORD.exe
212	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-1-5-21-889581200-2041691093-2048517887-1000\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
4144	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_4b340d05773eb8ef0da8377b53686eaf_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
1108	PING.EXE
932	PING.EXE
1432	PING.EXE
4144	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1108	PING.EXE
932	PING.EXE
1432	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1224 wrote to memory of 3488	1224	2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe	87
PID 3488 wrote to memory of 4144	3488	WINWORD.exe	88
PID 4144 wrote to memory of 1108	4144	cmd.exe	90
PID 4144 wrote to memory of 932	4144	cmd.exe	93
PID 4144 wrote to memory of 1432	4144	cmd.exe	98
PID 4144 wrote to memory of 212	4144	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_4b340d05773eb8ef0da8377b53686eaf_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1224
- 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:3488
- - 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\000075C2" 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:4144
  - - 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:1108
  - - 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:932
  - - 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:1432
  - - 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:212

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

Replay Monitor

Loading Replay Monitor...

Downloads

000075C2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000075C2
Size 39KB
SHA256 89d9fb49d7bc2c017199e3c162544ced70cfaba26b9772aeb03c24129cf70e5e
MD5 8568423aff80ef63bd8ca3d5fcd73e33
SHA1 0a15368ead2cc4dcec464a0531cf9f66d08e6f94
SHA512 85f17d32aca22a675604ae0bc7a18d866e794538f38daed5b7c4830bc8e4cbadaf33412fd054f6ba5b253edf20f8b5c43f443623b115355a67697e1e181de9d0
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB+:aLsF2Kerc64sTiX2IV0DVyIGF1
TLSH
T14C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 8e15caaffe21a771c11190bd8e8f3fe7963c5f9349e346d355d99f01fc8fac34
MD5 4b340d05773eb8ef0da8377b53686eaf
SHA1 7e81a6e19b93b77cf0a2702a4d64f7bbb978dcb4
SHA512 ec42d8cd5641f64a51f84b5561dbc0690cb2253f733bc082407cad92d7c33e9c9eb515d058a789ba2c2f25a1e01d2065beaf73077b4cc47d1d9e51c12d120f8b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBM:aLsF2Kerc64sTiX2IV0DVyIGFz
TLSH
T11C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/212-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/212-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1224-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1224-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3488-11-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3488-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads