juko | b10ce3ca894ffdf15d95846d11f766cddecbd88de2f7ab7b6025be3dd406862f

General

Target
2026-08-12_27999f236e1d62127cc2ce2192980b00_elex_wannacry.exe
Size 39KB
Sample260812-ebch9ayajc
SHA256 b10ce3ca894ffdf15d95846d11f766cddecbd88de2f7ab7b6025be3dd406862f
MD5 27999f236e1d62127cc2ce2192980b00
SHA1 19136e1e731874b36bbf3a3b05fe20813c187580
SHA512 7a16c334c2aa5693021e5e4bbfaf2aadc8184440fedbd86e7769a0c22837033537526560911088f46420177a3e8200fc04624dea1117240081f9fd8f7a422e6c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBi:aLsF2Kerc64sTiX2IV0DVyIGF5
TLSH
T1D2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4856-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5df-4.dat	family_juko
behavioral2/memory/4856-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4332-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5e0-13.dat	family_juko
behavioral2/memory/5924-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5924-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4332	WINWORD.exe
5924	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-1-5-21-1875162379-3804078649-638427191-1000\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
4904	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	2026-08-12_27999f236e1d62127cc2ce2192980b00_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
5996	PING.EXE
4784	PING.EXE
5840	PING.EXE
4904	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4784	PING.EXE
5840	PING.EXE
5996	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4856 wrote to memory of 4332	4856	2026-08-12_27999f236e1d62127cc2ce2192980b00_elex_wannacry.exe	89
PID 4332 wrote to memory of 4904	4332	WINWORD.exe	90
PID 4904 wrote to memory of 5996	4904	cmd.exe	92
PID 4904 wrote to memory of 4784	4904	cmd.exe	93
PID 4904 wrote to memory of 5840	4904	cmd.exe	94
PID 4904 wrote to memory of 5924	4904	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-12_27999f236e1d62127cc2ce2192980b00_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_27999f236e1d62127cc2ce2192980b00_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4856
- 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:4332
- - 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\000061DE" 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:4904
  - - 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:5996
  - - 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:4784
  - - 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:5840
  - - 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:5924

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:4364

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

000061DE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000061DE
Size 39KB
SHA256 b393cf68bfb9085029f453970f611276975daecdb39216b75ff7466452424ae2
MD5 059021d0f48ac355f32957f0f810bbd8
SHA1 8b33cd49bf2f3d04a066c016842ea5bbd344742c
SHA512 7fa3ad68c79a40386a01f42c6b7725908697d68d0796194159edcf6a349a91c76f170498283da19de4091eb57baacb71340327fad4a826dee1a5ff661f9eeb30
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBp:aLsF2Kerc64sTiX2IV0DVyIGFW
TLSH
T1FA036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 b10ce3ca894ffdf15d95846d11f766cddecbd88de2f7ab7b6025be3dd406862f
MD5 27999f236e1d62127cc2ce2192980b00
SHA1 19136e1e731874b36bbf3a3b05fe20813c187580
SHA512 7a16c334c2aa5693021e5e4bbfaf2aadc8184440fedbd86e7769a0c22837033537526560911088f46420177a3e8200fc04624dea1117240081f9fd8f7a422e6c
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBi:aLsF2Kerc64sTiX2IV0DVyIGF5
TLSH
T1D2036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4332-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4856-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4856-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5924-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5924-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads