juko | a68928f4084b924ac769505bc81886736f592ff62ce795e7b68107ad271ab214

General

Target
2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe
Size 39KB
Sample260809-aptmgafl5w
SHA256 a68928f4084b924ac769505bc81886736f592ff62ce795e7b68107ad271ab214
MD5 09b2248d2b045f87c2e8ff6a9bb95bbd
SHA1 a61122e9ccbf1d2bc8b60f32acc8e2daa7b2ba94
SHA512 b091f3f24be185361288b2b57944987f44426666ca0a98bc2f948d4afa0da79e53882baa8a7bc2c2c168916ac3b8ee9016ea8e72d486cebc1f8d485116f696fe
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBy:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1AA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/1680-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000c0000000241e3-5.dat	family_juko
behavioral1/memory/4900-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1680-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4900-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0008000000024323-16.dat	family_juko
behavioral1/memory/1112-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1112-19-0x0000000000400000-0x000000000041D000-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	2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_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
4900	WINWORD.exe
1112	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
4532	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	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	2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
4532	cmd.exe
4964	PING.EXE
4972	PING.EXE
4324	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4964	PING.EXE
4972	PING.EXE
4324	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1680 wrote to memory of 4900	1680	2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe	84
PID 4900 wrote to memory of 4532	4900	WINWORD.exe	85
PID 4532 wrote to memory of 4964	4532	cmd.exe	87
PID 4532 wrote to memory of 4972	4532	cmd.exe	89
PID 4532 wrote to memory of 4324	4532	cmd.exe	92
PID 4532 wrote to memory of 1112	4532	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_09b2248d2b045f87c2e8ff6a9bb95bbd_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1680
- 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:4900
- - 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\00007681" 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:4532
  - - 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:4964
  - - 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:4972
  - - 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:4324
  - - 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:1112

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

00007681

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007681
Size 39KB
SHA256 fd37313755f519227244eaedf576d1b82eeba125f7a8d08fa7d63b5e5ce58ee6
MD5 18d307e27814a1e39877ec94b7d61729
SHA1 07f45292493ec26d77f03f616c90e14a9835205b
SHA512 7b2d9858f14e2a8216e758cb0c58c5864929e70518a8384d3d1935744ada46adef94a8ab392d4ea5063739813def3b9c67ec03633a18cd6cf6811030e7cf38f5
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBG:aLsF2Kerc64sTiX2IV0DVyIGF9
TLSH
T160035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 a68928f4084b924ac769505bc81886736f592ff62ce795e7b68107ad271ab214
MD5 09b2248d2b045f87c2e8ff6a9bb95bbd
SHA1 a61122e9ccbf1d2bc8b60f32acc8e2daa7b2ba94
SHA512 b091f3f24be185361288b2b57944987f44426666ca0a98bc2f948d4afa0da79e53882baa8a7bc2c2c168916ac3b8ee9016ea8e72d486cebc1f8d485116f696fe
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBy:aLsF2Kerc64sTiX2IV0DVyIGFd
TLSH
T1AA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1112-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1112-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1680-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1680-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4900-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4900-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads