juko | 4816b56256a20c4b3c77e9fe66909bec70aa963106aa3b0a234c4793ef673e60

General

Target
2026-08-25_c01ab4ea43af5ec486d9461d56feced4_elex_wannacry.exe
Size 39KB
Sample260826-narffsxene
SHA256 4816b56256a20c4b3c77e9fe66909bec70aa963106aa3b0a234c4793ef673e60
MD5 c01ab4ea43af5ec486d9461d56feced4
SHA1 b27d5e86aa1cdc06de7f7803bea44a15993e56fe
SHA512 802106ccdae934872774f8c041889aa3ee6167049e7364868b039f2de01383525d4c1ca45dc575dc89d0be7acddc285a357bb8316b25e2424fae99b53a94315a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBE:aLsF2Kerc64sTiX2IV0DVyIGFn
TLSH
T139036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 7 IoCs

resource	yara_rule
behavioral1/memory/1804-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000900000001e42d-5.dat	family_juko
behavioral1/memory/1804-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2884-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000d00000002446c-15.dat	family_juko
behavioral1/memory/3996-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3996-18-0x0000000000400000-0x000000000041D000-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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-08-25_c01ab4ea43af5ec486d9461d56feced4_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2884	WINWORD.exe
3996	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-1-5-21-2370214745-1838013427-2987045292-1000\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
4600	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	2026-08-25_c01ab4ea43af5ec486d9461d56feced4_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
4600	cmd.exe
1652	PING.EXE
4684	PING.EXE
1072	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1652	PING.EXE
4684	PING.EXE
1072	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1804 wrote to memory of 2884	1804	2026-08-25_c01ab4ea43af5ec486d9461d56feced4_elex_wannacry.exe	85
PID 2884 wrote to memory of 4600	2884	WINWORD.exe	86
PID 4600 wrote to memory of 1652	4600	cmd.exe	88
PID 4600 wrote to memory of 4684	4600	cmd.exe	89
PID 4600 wrote to memory of 1072	4600	cmd.exe	90
PID 4600 wrote to memory of 3996	4600	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-25_c01ab4ea43af5ec486d9461d56feced4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_c01ab4ea43af5ec486d9461d56feced4_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1804
- 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:2884
- - 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\00005E78" 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:4600
  - - 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:1652
  - - 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:4684
  - - 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:1072
  - - 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:3996

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

00005E78

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005E78
Size 39KB
SHA256 bf13002737b7fbbe65f216ea6a4995fe7ed2dbd1cfe29a8f85dfc2b1545753f4
MD5 e46fbcf033d1fb9c0c40716ec09812d1
SHA1 49a6e43286f7233011cc1ad9d781cbb4bdd358e4
SHA512 8fd82f596e4b13b84a640154eb84c53a8b7d0abaf95a24eae7a59e258f3fcf069e5ba598c2f27836f5fb3defc26b82f0389033e1c68a39bbb28fb614c10e1cd9
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBL:aLsF2Kerc64sTiX2IV0DVyIGF4
TLSH
T190036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 4816b56256a20c4b3c77e9fe66909bec70aa963106aa3b0a234c4793ef673e60
MD5 c01ab4ea43af5ec486d9461d56feced4
SHA1 b27d5e86aa1cdc06de7f7803bea44a15993e56fe
SHA512 802106ccdae934872774f8c041889aa3ee6167049e7364868b039f2de01383525d4c1ca45dc575dc89d0be7acddc285a357bb8316b25e2424fae99b53a94315a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBE:aLsF2Kerc64sTiX2IV0DVyIGFn
TLSH
T139036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1804-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1804-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2884-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3996-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3996-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads