juko | 10c70a40842fac27f65838a30651fdddf4bcc63ebfd0a433d36e336dc444b6fc

General

Target
2026-08-08_677bc7f34266ac11c7aba8d9dfcd9947_elex_wannacry.exe
Size 49KB
Sample260808-ktnl5acf29
SHA256 10c70a40842fac27f65838a30651fdddf4bcc63ebfd0a433d36e336dc444b6fc
MD5 677bc7f34266ac11c7aba8d9dfcd9947
SHA1 0f4a0301e9decd874dc2f7f6e4ce1872a067a890
SHA512 520ac8b2a4b008bd968ec3cb237c37377558159524af84e125cd1ea750c2a65a03cc7f1dfb0aaf4f8db0b5388436966228e0d567246a5379854ac0117c039696
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2R:4Ly2Kerc64CiGImVu8p4kojWh2R
TLSH
T12C334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4324-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b714-5.dat	family_juko
behavioral2/memory/4324-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5328-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001c402-13.dat	family_juko
behavioral2/memory/3176-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3176-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5328	WINWORD.exe
3176	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-1-5-21-552508041-2681165170-3229858294-1000\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
764	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	2026-08-08_677bc7f34266ac11c7aba8d9dfcd9947_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
764	cmd.exe
4520	PING.EXE
3532	PING.EXE
1096	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1096	PING.EXE
4520	PING.EXE
3532	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4324 wrote to memory of 5328	4324	2026-08-08_677bc7f34266ac11c7aba8d9dfcd9947_elex_wannacry.exe	89
PID 5328 wrote to memory of 764	5328	WINWORD.exe	90
PID 764 wrote to memory of 4520	764	cmd.exe	92
PID 764 wrote to memory of 3532	764	cmd.exe	93
PID 764 wrote to memory of 1096	764	cmd.exe	94
PID 764 wrote to memory of 3176	764	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_677bc7f34266ac11c7aba8d9dfcd9947_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_677bc7f34266ac11c7aba8d9dfcd9947_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4324
- 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:5328
- - 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\00006277" 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:764
  - - 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:4520
  - - 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:3532
  - - 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:1096
  - - 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:3176

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

00006277

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006277
Size 49KB
SHA256 17482b3f9b8a51cbd74a2cda6e73f7032e6ef583a01d69ecb681dd1b671bbb91
MD5 038c35afb52f8f3ad527afd1c9681bf3
SHA1 c5dfde4bd145c2126fc33faf49b0fb93ed282834
SHA512 1de993e8637e735fea25a471bda2ab5a28c91db9815109a1df7a1c29b76e21fcfa7f1d17d94d5b26ba2f7669708a363ca3343d69560078395a6216a7a2759058
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2W:4Ly2Kerc64CiGImVu8p4kojWh2W
TLSH
T1E9334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 10c70a40842fac27f65838a30651fdddf4bcc63ebfd0a433d36e336dc444b6fc
MD5 677bc7f34266ac11c7aba8d9dfcd9947
SHA1 0f4a0301e9decd874dc2f7f6e4ce1872a067a890
SHA512 520ac8b2a4b008bd968ec3cb237c37377558159524af84e125cd1ea750c2a65a03cc7f1dfb0aaf4f8db0b5388436966228e0d567246a5379854ac0117c039696
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2R:4Ly2Kerc64CiGImVu8p4kojWh2R
TLSH
T12C334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3176-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3176-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4324-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4324-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5328-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads