juko | a2c4a6f66a0cf56ad126967b084fa4385da4c0839c633a757f14e9fa325cb250

General

Target
2026-08-03_38eb1d8db8b76e94c48b2672f3222648_elex_wannacry.exe
Size 37KB
Sample260803-lcajlsvzcs
SHA256 a2c4a6f66a0cf56ad126967b084fa4385da4c0839c633a757f14e9fa325cb250
MD5 38eb1d8db8b76e94c48b2672f3222648
SHA1 b36cc61459e734e781439034c0a17d3ee08bd9e1
SHA512 3948932f9690ea5ee432c1f41036b934286533b291c624dfe52333df195bbcab26db71dbe4cb4405a3008907ccdb672123c8f5e4e4e312a23271056cadbce44a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywao:3LsF2Kerc64sTiX2IV0DhuogwT
TLSH
T149035C1A299160A2D55310B0E9D81FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5024-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001c0000000187a6-5.dat	family_juko
behavioral2/memory/5024-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1288-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001100000001c4ff-13.dat	family_juko
behavioral2/memory/2800-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2800-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1288	WINWORD.exe
2800	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-1-5-21-1079202589-886135813-2527035092-1000\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
4504	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	2026-08-03_38eb1d8db8b76e94c48b2672f3222648_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
3852	PING.EXE
4648	PING.EXE
700	PING.EXE
4504	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3852	PING.EXE
4648	PING.EXE
700	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5024 wrote to memory of 1288	5024	2026-08-03_38eb1d8db8b76e94c48b2672f3222648_elex_wannacry.exe	89
PID 1288 wrote to memory of 4504	1288	WINWORD.exe	90
PID 4504 wrote to memory of 3852	4504	cmd.exe	92
PID 4504 wrote to memory of 4648	4504	cmd.exe	93
PID 4504 wrote to memory of 700	4504	cmd.exe	94
PID 4504 wrote to memory of 2800	4504	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_38eb1d8db8b76e94c48b2672f3222648_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_38eb1d8db8b76e94c48b2672f3222648_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5024
- 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:1288
- - 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\00005805" 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:4504
  - - 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:3852
  - - 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:4648
  - - 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:700
  - - 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:2800

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

00005805

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005805
Size 37KB
SHA256 50fe060a1efa9d0c40adeda87c5d03891541177e440f289aef36c320846c5b38
MD5 e743c7f12315442720c2ac33f55bc07c
SHA1 2afe305f95f6b21763e50b001062cdc336b195c1
SHA512 461e969fdadf245d2f47221c9e151ee92b97de9cbf81fa60e2c55b8dc288df989b52b9e872687cbf844f59397171977495ee5a79e33d1bf9f473c084db6edba5
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa8:3LsF2Kerc64sTiX2IV0Dhuogwz
TLSH
T1E3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 a2c4a6f66a0cf56ad126967b084fa4385da4c0839c633a757f14e9fa325cb250
MD5 38eb1d8db8b76e94c48b2672f3222648
SHA1 b36cc61459e734e781439034c0a17d3ee08bd9e1
SHA512 3948932f9690ea5ee432c1f41036b934286533b291c624dfe52333df195bbcab26db71dbe4cb4405a3008907ccdb672123c8f5e4e4e312a23271056cadbce44a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywao:3LsF2Kerc64sTiX2IV0DhuogwT
TLSH
T149035C1A299160A2D55310B0E9D81FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1288-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2800-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2800-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5024-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5024-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads