juko | 87f0cc066949f1d772e9cab635253988357a17bb2926312edd7b3a90f1eb6eee

General

Target
2026-08-01_05a1f2086c1ff2736cf203aaea9439a6_elex_wannacry.exe
Size 48KB
Sample260802-e1epxas1gy
SHA256 87f0cc066949f1d772e9cab635253988357a17bb2926312edd7b3a90f1eb6eee
MD5 05a1f2086c1ff2736cf203aaea9439a6
SHA1 68023e2f6e720e752afaaec3bef9fcc7dab84b55
SHA512 0b6508d1ad2161c7528641124d9186537557f7e3df5138924dce3bd8cd44b5fb6646d11a4a00e6ce38ab44cdb4a724c1f8e45e02f3a981b678e6f3e4a553f1e3
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8W:bLy2Kerc64CiGImav42j0O
TLSH
T168234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/1804-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/1804-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2276-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001100000001c4c3-13.dat	family_juko
behavioral2/memory/2752-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2752-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2276	WINWORD.exe
2752	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-1-5-21-1738198120-2966725515-3980530802-1000\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
3228	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_05a1f2086c1ff2736cf203aaea9439a6_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

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
3228	cmd.exe
4856	PING.EXE
5844	PING.EXE
2108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4856	PING.EXE
5844	PING.EXE
2108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1804 wrote to memory of 2276	1804	2026-08-01_05a1f2086c1ff2736cf203aaea9439a6_elex_wannacry.exe	89
PID 2276 wrote to memory of 3228	2276	WINWORD.exe	90
PID 3228 wrote to memory of 4856	3228	cmd.exe	92
PID 3228 wrote to memory of 5844	3228	cmd.exe	93
PID 3228 wrote to memory of 2108	3228	cmd.exe	94
PID 3228 wrote to memory of 2752	3228	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_05a1f2086c1ff2736cf203aaea9439a6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_05a1f2086c1ff2736cf203aaea9439a6_elex_wannacry.exe"
1⤵
- 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⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2276
- - 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\00005E66" 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:3228
  - - 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:4856
  - - 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:5844
  - - 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:2108
  - - 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:2752

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

Replay Monitor

Loading Replay Monitor...

Downloads

00005E66

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005E66
Size 48KB
SHA256 ae1554874c75ef43252dd8f1bc0f53f4646cd783837bc272157316fe4159977e
MD5 c707fc19afe19480bbb08c665eac76d0
SHA1 6f871147ad186d4bbebc94f5c170a1804935532e
SHA512 60d31327a129dbe501ece875dc7dc2c1edd93ec904d81dae96da7e03931a29f6605a0d165a33ee0239fbd478ec8088f53d77003d11a8190325c4225c622cfee6
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v86:bLy2Kerc64CiGImav42j0y
TLSH
T1B2234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 87f0cc066949f1d772e9cab635253988357a17bb2926312edd7b3a90f1eb6eee
MD5 05a1f2086c1ff2736cf203aaea9439a6
SHA1 68023e2f6e720e752afaaec3bef9fcc7dab84b55
SHA512 0b6508d1ad2161c7528641124d9186537557f7e3df5138924dce3bd8cd44b5fb6646d11a4a00e6ce38ab44cdb4a724c1f8e45e02f3a981b678e6f3e4a553f1e3
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8W:bLy2Kerc64CiGImav42j0O
TLSH
T168234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1804-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1804-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2276-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2752-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2752-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads