juko | 19b66baa530ef58f16d4921338f84a153ef3486dd44b76abdbbf3a762bdc22f7

General

Target
2026-07-17_d28295e4cc4a6c8e2918f9b3eb994858_elex_wannacry.exe
Size 39KB
Sample260718-cde12sgt2w
SHA256 19b66baa530ef58f16d4921338f84a153ef3486dd44b76abdbbf3a762bdc22f7
MD5 d28295e4cc4a6c8e2918f9b3eb994858
SHA1 931cd69288faa3f6e603b9a69cc1a93b61885eda
SHA512 4a15936afc302434a6929f4b4d7ff26d760d2708d0184b0d141023b6b893058d2047264822f64fdf153f3989ca29d6af621f2251579f9c0d32510fc945121ac7
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBX:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T10C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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
behavioral2/memory/4432-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001200000001b303-5.dat	family_juko
behavioral2/memory/4432-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3364-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c571-13.dat	family_juko
behavioral2/memory/1956-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1956-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3364	WINWORD.exe
1956	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-1-5-21-4046655672-1449839301-2197395821-1000\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
2968	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-17_d28295e4cc4a6c8e2918f9b3eb994858_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
2968	cmd.exe
528	PING.EXE
4532	PING.EXE
2840	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
528	PING.EXE
4532	PING.EXE
2840	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4432 wrote to memory of 3364	4432	2026-07-17_d28295e4cc4a6c8e2918f9b3eb994858_elex_wannacry.exe	89
PID 3364 wrote to memory of 2968	3364	WINWORD.exe	90
PID 2968 wrote to memory of 528	2968	cmd.exe	92
PID 2968 wrote to memory of 4532	2968	cmd.exe	93
PID 2968 wrote to memory of 2840	2968	cmd.exe	94
PID 2968 wrote to memory of 1956	2968	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-17_d28295e4cc4a6c8e2918f9b3eb994858_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-17_d28295e4cc4a6c8e2918f9b3eb994858_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4432
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3364
- - 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\00005FFE" 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:2968
  - - 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:528
  - - 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: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:2840
  - - 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:1956

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00005FFE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005FFE
Size 39KB
SHA256 8e6c0e288f19e5c557fcb98af9a27e713f5dd60222e911c1733985a19b6d6786
MD5 be1efb49524765dcff94a71c516021d6
SHA1 6683932de9f6f852cc42f9085d92d46f3d1f11f0
SHA512 cd3a8fdbe9d36068d8b241f34699916259374ff529f10cd7277a62d7d4d7f32d4357236ab04dafa977b1cfb9b2c776c7a0c5f7002e38cdfc2905ec29d62c3626
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSB9:aLsF2Kerc64sTiX2IV0DVyIGFO
TLSH
T1BA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 19b66baa530ef58f16d4921338f84a153ef3486dd44b76abdbbf3a762bdc22f7
MD5 d28295e4cc4a6c8e2918f9b3eb994858
SHA1 931cd69288faa3f6e603b9a69cc1a93b61885eda
SHA512 4a15936afc302434a6929f4b4d7ff26d760d2708d0184b0d141023b6b893058d2047264822f64fdf153f3989ca29d6af621f2251579f9c0d32510fc945121ac7
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBX:aLsF2Kerc64sTiX2IV0DVyIGF8
TLSH
T10C036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1956-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1956-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3364-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4432-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4432-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads