juko | dcad621b6d27c88ee137a0603159d21bbd6c9bdfe96a42ba9c73d8d55b528cda

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
03/05/2026, 16:17

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General

Target
2026-05-03_fa063f567e0d457bd680eb7bd6783bc3_elex_wannacry.exe
Size 57KB
Sample260503-tree4sds8s
SHA256 dcad621b6d27c88ee137a0603159d21bbd6c9bdfe96a42ba9c73d8d55b528cda
MD5 fa063f567e0d457bd680eb7bd6783bc3
SHA1 967d1f9e5ff5e6d38b8bb9e50aa98973fb3b3757
SHA512 f931c4d7b8538bbedae7bc58b20dd1400f32bb34841d37eb96ab3fb729431ee51770fe0dcaf63f82adf844885d3359d8525d2df24fb2cc8b988c1bdba873f4a9
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQz:qLy2Kerc64CiGImklNUyp8TI
TLSH
T11B433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/2852-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001a00000002a109-5.dat	family_juko
behavioral2/memory/2852-13-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3152-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000600000002a648-17.dat	family_juko
behavioral2/memory/3572-19-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3572-28-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3152	WINWORD.exe
3572	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-1-5-21-650218026-1419908266-2856590055-1000\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

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-03_fa063f567e0d457bd680eb7bd6783bc3_elex_wannacry.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
5080	cmd.exe
5276	PING.EXE
5008	PING.EXE
3492	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5276	PING.EXE
5008	PING.EXE
3492	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2852 wrote to memory of 3152	2852	2026-05-03_fa063f567e0d457bd680eb7bd6783bc3_elex_wannacry.exe	79
PID 3152 wrote to memory of 5080	3152	WINWORD.exe	80
PID 5080 wrote to memory of 5276	5080	cmd.exe	82
PID 5080 wrote to memory of 5008	5080	cmd.exe	83
PID 5080 wrote to memory of 3492	5080	cmd.exe	84
PID 5080 wrote to memory of 3572	5080	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-03_fa063f567e0d457bd680eb7bd6783bc3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-03_fa063f567e0d457bd680eb7bd6783bc3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2852
- 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:3152
- - 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\00004DEC" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5080
  - - 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:5276
  - - 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:5008
  - - 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:3492
  - - 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:3572

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00004DEC

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004DEC
Size 57KB
SHA256 1bf3276cbb8a21602305f8d18e2cf6091ef63445ea06ae4e9e0e2f6edda1ca38
MD5 3c82d8f4da259bf1000e71f1dbc2f9f3
SHA1 ada4eb0cb12907f6800df7aabd5cc0975e02d7d1
SHA512 67c6e0061193d4b946b5e7bd989620a707edfae645e15870469986aac8607aa7807c9e595c315db9aae0b18fffce690c555b31ddff6e1dad93cdef10a7af843c
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQB:qLy2Kerc64CiGImklNUyp8Tm
TLSH
T18D433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 dcad621b6d27c88ee137a0603159d21bbd6c9bdfe96a42ba9c73d8d55b528cda
MD5 fa063f567e0d457bd680eb7bd6783bc3
SHA1 967d1f9e5ff5e6d38b8bb9e50aa98973fb3b3757
SHA512 f931c4d7b8538bbedae7bc58b20dd1400f32bb34841d37eb96ab3fb729431ee51770fe0dcaf63f82adf844885d3359d8525d2df24fb2cc8b988c1bdba873f4a9
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQz:qLy2Kerc64CiGImklNUyp8TI
TLSH
T11B433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2852-12-0x0000000000840000-0x0000000000902000-memory.dmp

Download

memory/2852-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2852-13-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3152-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3152-15-0x0000000000840000-0x0000000000902000-memory.dmp

Download

memory/3572-19-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3572-20-0x0000000000980000-0x0000000000A42000-memory.dmp

Download

memory/3572-22-0x0000000000980000-0x0000000000A42000-memory.dmp

Download

memory/3572-28-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3572-33-0x0000000000980000-0x0000000000A42000-memory.dmp

Download

memory/3572-34-0x0000000000980000-0x0000000000A42000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads