juko | fa7b7e1bfe902af93451a0a69575e0de85e66228c2f7c84bb989c7590e24276c

General

Target
2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe
Size 48KB
Sample260804-gp226sxtcw
SHA256 fa7b7e1bfe902af93451a0a69575e0de85e66228c2f7c84bb989c7590e24276c
MD5 a5e966100a3a1251ee7d8350c9af11bf
SHA1 fc822749334c3c7d3d5e1e1159c03a9735b98f12
SHA512 284d29895a2e2a426c412c02cc6bf45cc918b01cd18b3c8a3995a7ff4dd6de4ab50152210d5034f221fcdfbcbd0e9bedf0078c411560418d5f9538107ac38726
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8N:bLy2Kerc64CiGImav42j0V
TLSH
T1BA234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/1640-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00110000000217bd-5.dat	family_juko
behavioral1/memory/3924-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1640-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3924-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000243dc-16.dat	family_juko
behavioral1/memory/3516-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3516-19-0x0000000000400000-0x0000000000420000-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	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3924	WINWORD.exe
3516	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
2424	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	2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_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
3116	PING.EXE
4684	PING.EXE
2424	cmd.exe
2924	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2924	PING.EXE
3116	PING.EXE
4684	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1640 wrote to memory of 3924	1640	2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe	87
PID 3924 wrote to memory of 2424	3924	WINWORD.exe	88
PID 2424 wrote to memory of 2924	2424	cmd.exe	90
PID 2424 wrote to memory of 3116	2424	cmd.exe	91
PID 2424 wrote to memory of 4684	2424	cmd.exe	92
PID 2424 wrote to memory of 3516	2424	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_a5e966100a3a1251ee7d8350c9af11bf_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1640
- 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:3924
- - 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\000003FD" 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:2424
  - - 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:2924
  - - 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:3116
  - - 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:\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:3516

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

000003FD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000003FD
Size 48KB
SHA256 5b0ea4c55f75f81ed49314f7bdb916a472fca209b37e5090932c59f1aff10be1
MD5 768623a56de5eb2518f2a717aca2aad0
SHA1 19f5c847a9b4809cc89a9785549480f2249470d6
SHA512 0f3aa1659081358ac3f9fa48111f1918bd31266bc8712d0a0142add9c7013b7ba868d5c416de4f3412c6dadd28a2157b3b989c01f2dd5157750391422d449b81
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8n:bLy2Kerc64CiGImav42j0P
TLSH
T1AD234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 fa7b7e1bfe902af93451a0a69575e0de85e66228c2f7c84bb989c7590e24276c
MD5 a5e966100a3a1251ee7d8350c9af11bf
SHA1 fc822749334c3c7d3d5e1e1159c03a9735b98f12
SHA512 284d29895a2e2a426c412c02cc6bf45cc918b01cd18b3c8a3995a7ff4dd6de4ab50152210d5034f221fcdfbcbd0e9bedf0078c411560418d5f9538107ac38726
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8N:bLy2Kerc64CiGImav42j0V
TLSH
T1BA234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1640-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1640-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3516-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3516-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3924-11-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3924-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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