juko | c2f800e1cc1e7c89aabda0c78efff18487f47b7b0335bcdf702e70dbf73798dd

General

Target
2026-08-09_5ec78fb4a68c8b27081a4136c64e2f7c_elex_wannacry.exe
Size 37KB
Sample260809-eqvclshk3t
SHA256 c2f800e1cc1e7c89aabda0c78efff18487f47b7b0335bcdf702e70dbf73798dd
MD5 5ec78fb4a68c8b27081a4136c64e2f7c
SHA1 de969ff621f8f38aeefb324eaf131cb0df962ab3
SHA512 435eaf8ecac471072cb8ef82b7fe067b5543b390523f310cdee45c74f52e527e64748779aae585d0a6b708f4bfe6873db3b04617ee58077dcfe587dc8ae44e91
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaE:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T17C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/4836-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b3-5.dat	family_juko
behavioral2/memory/4836-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2832-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5b4-13.dat	family_juko
behavioral2/memory/432-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/432-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2832	WINWORD.exe
432	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-1-5-21-3986082593-3624157295-3514260330-1000\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
2632	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	2026-08-09_5ec78fb4a68c8b27081a4136c64e2f7c_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
2632	cmd.exe
3856	PING.EXE
5208	PING.EXE
1588	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5208	PING.EXE
1588	PING.EXE
3856	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 2832	4836	2026-08-09_5ec78fb4a68c8b27081a4136c64e2f7c_elex_wannacry.exe	88
PID 2832 wrote to memory of 2632	2832	WINWORD.exe	89
PID 2632 wrote to memory of 3856	2632	cmd.exe	91
PID 2632 wrote to memory of 5208	2632	cmd.exe	92
PID 2632 wrote to memory of 1588	2632	cmd.exe	93
PID 2632 wrote to memory of 432	2632	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-09_5ec78fb4a68c8b27081a4136c64e2f7c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_5ec78fb4a68c8b27081a4136c64e2f7c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- 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:2832
- - 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\00006417" 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:2632
  - - 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:3856
  - - 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:5208
  - - 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:1588
  - - 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:432

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

00006417

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006417
Size 37KB
SHA256 2614be8320ba2ffa4809def6ded81e584edcf5a9cdd61a91a367871252bea7dd
MD5 e362aa98b4241ee1ba32376cac4021d1
SHA1 2bca2922647e5fefd27c62c34ceb93852dab0197
SHA512 9d7141e8a242a13e66554157d2d9123d353b83dcba4a41ddc2449c6654ab64ba21645edfb46f0fb66482fdbb901a46852013c4adbd1dfaa0df1258878d40e596
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywal:3LsF2Kerc64sTiX2IV0Dhuogw6
TLSH
T14C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 c2f800e1cc1e7c89aabda0c78efff18487f47b7b0335bcdf702e70dbf73798dd
MD5 5ec78fb4a68c8b27081a4136c64e2f7c
SHA1 de969ff621f8f38aeefb324eaf131cb0df962ab3
SHA512 435eaf8ecac471072cb8ef82b7fe067b5543b390523f310cdee45c74f52e527e64748779aae585d0a6b708f4bfe6873db3b04617ee58077dcfe587dc8ae44e91
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaE:3LsF2Kerc64sTiX2IV0DhuogwX
TLSH
T17C035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/432-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/432-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2832-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4836-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4836-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads