862b8fb40587136cc691b8c17329ef64fe20e228472ebb27e95a96d304e10348

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
09/08/2026, 10:16

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General

Target
2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe
Size 587KB
Sample260809-ma2qrawbkb
SHA256 862b8fb40587136cc691b8c17329ef64fe20e228472ebb27e95a96d304e10348
MD5 3ab658f92a6e2e3a91cb41133fea8274
SHA1 24c3c0422e925a70ae254e732134119d729f6900
SHA512 243e848b8123f0a4a27f1b58843ce75c310c01996e8bcbeec3a2c38ecdff3718c38cbf8894ae21abac9beab24406a84aa1f32250c50babd55acc98b6df3b8f38
SSDEEP 6144:AhBqzw2w/0s/DbAgeonk7n7m8po+yUOKKNG0IxSjXKP+lAXDG:aqzw2wsEDbZ67fpLyUB/5qLlADG
TLSH
T186D4AD13B2E4C855E1A22A32CC7663B0DEF5BED4D9358A1F5F843A4D2933E00A6157A7
MD5 SHA1 SHA512 SSDEEP TLSH

Score

9^/10

bootkit discovery execution persistence spyware stealer upx

Malware Config

Signatures

Detects executables containing base64 encoded User Agent 5 IoCs

resource	yara_rule
behavioral1/memory/1412-16-0x0000000010000000-0x0000000010052000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1412-17-0x0000000010000000-0x0000000010052000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1412-18-0x0000000010000000-0x0000000010052000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1412-21-0x0000000010000000-0x0000000010052000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1412-24-0x0000000010000000-0x0000000010052000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral1/memory/716-0-0x0000000000400000-0x000000000048B000-memory.dmp	UPX
behavioral1/memory/716-2-0x0000000000400000-0x000000000048B000-memory.dmp	UPX
behavioral1/files/0x000a000000024366-4.dat	UPX
behavioral1/memory/3616-11-0x0000000000400000-0x000000000048B000-memory.dmp	UPX

Deletes itself 1 IoCs

pid	Process
3616	mbbci.exe

Executes dropped EXE 2 IoCs

pid	Process
3616	mbbci.exe
1412	arcz.exe

Loads dropped DLL 1 IoCs

pid	Process
1412	arcz.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

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-1-5-21-540052884-2969440504-464782435-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dtfd = "c:\\Program Files\\byzzr\\arcz.exe \"c:\\Program Files\\byzzr\\arczu.dll\",DoAddToFavDlg"	arcz.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\y:	arcz.exe
File opened (read-only)	\??\z:	arcz.exe
File opened (read-only)	\??\a:	arcz.exe
File opened (read-only)	\??\b:	arcz.exe
File opened (read-only)	\??\k:	arcz.exe
File opened (read-only)	\??\m:	arcz.exe
File opened (read-only)	\??\q:	arcz.exe
File opened (read-only)	\??\s:	arcz.exe
File opened (read-only)	\??\t:	arcz.exe
File opened (read-only)	\??\g:	arcz.exe
File opened (read-only)	\??\i:	arcz.exe
File opened (read-only)	\??\v:	arcz.exe
File opened (read-only)	\??\w:	arcz.exe
File opened (read-only)	\??\x:	arcz.exe
File opened (read-only)	\??\h:	arcz.exe
File opened (read-only)	\??\j:	arcz.exe
File opened (read-only)	\??\l:	arcz.exe
File opened (read-only)	\??\u:	arcz.exe
File opened (read-only)	\??\e:	arcz.exe
File opened (read-only)	\??\n:	arcz.exe
File opened (read-only)	\??\o:	arcz.exe
File opened (read-only)	\??\p:	arcz.exe
File opened (read-only)	\??\r:	arcz.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	arcz.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/716-0-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral1/memory/716-2-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral1/files/0x000a000000024366-4.dat	upx
behavioral1/memory/3616-11-0x0000000000400000-0x000000000048B000-memory.dmp	upx

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	\??\c:\Program Files\byzzr\arcz.exe	mbbci.exe
File opened for modification	\??\c:\Program Files\byzzr\arcz.exe	mbbci.exe
File opened for modification	\??\c:\Program Files\byzzr	mbbci.exe
File created	\??\c:\Program Files\byzzr\arczu.dll	mbbci.exe

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
3640	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 5 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_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.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	mbbci.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	arcz.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3640	cmd.exe
4640	PING.EXE

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	arcz.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	arcz.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4640	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1412	arcz.exe
1412	arcz.exe
1412	arcz.exe
1412	arcz.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1412	arcz.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
716	2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe
3616	mbbci.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 716 wrote to memory of 3640	716	2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe	85
PID 3640 wrote to memory of 4640	3640	cmd.exe	87
PID 3640 wrote to memory of 3616	3640	cmd.exe	88
PID 3616 wrote to memory of 1412	3616	mbbci.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:716
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\mbbci.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe"
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3640
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4640
- - C:\Users\Admin\AppData\Local\Temp\mbbci.exe
    C:\Users\Admin\AppData\Local\Temp\\mbbci.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-09_3ab658f92a6e2e3a91cb41133fea8274_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3616
  - - \??\c:\Program Files\byzzr\arcz.exe
      "c:\Program Files\byzzr\arcz.exe" "c:\Program Files\byzzr\arczu.dll",DoAddToFavDlg C:\Users\Admin\AppData\Local\Temp\mbbci.exe
      4⤵
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1412

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

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

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

arcz.exe

Path C:\Program Files\byzzr\arcz.exe
Size 60KB
SHA256 6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910
MD5 889b99c52a60dd49227c5e485a016679
SHA1 8fa889e456aa646a4d0a4349977430ce5fa5e2d7
SHA512 08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641
SSDEEP 1536:H9ykYCTdiHQKrFXmw2RQln5IUmDjoX6+:HlMHprF2nRQln5I
TLSH
T127532AC2FA00C171D4A7563019778F1A5766AC13DB728ACB94B0B4A41EB3291AD3E5FF
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

mbbci.exe

Path C:\Users\Admin\AppData\Local\Temp\mbbci.exe
Size 587KB
SHA256 2ac0de9b54ddaf3e3fe22080b97da2640c9198c760e269ff9dc6e7b1adf05ef6
MD5 e0b3e287df2cd07096d8958a15d91921
SHA1 c61eec6a2c139b906faf0c7bffcc0c8eff3395e4
SHA512 5a8e40cea1423306e975f47e4167909a6489b714dad09ad53761e864c442fcbdbba50c90234ef43e11936366a59e2e089046a6866c65803749654bc3be3e4b18
SSDEEP 6144:AhBqzw2w/0s/DbAgeonk7n7m8po+yUOKKNG0IxSjXKP+lAXDh:aqzw2wsEDbZ67fpLyUB/5qLlADh
TLSH
T174D4AD13B2E4C855E1A22A32CC7663B0DEF5BED4D9358A1F5F843A4D2933E00A7157A7
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

arczu.dll

Path \??\c:\Program Files\byzzr\arczu.dll
Size 171KB
SHA256 8d5eb75ac08509592307de5bca2f483ff85283291d1f2c85671ba144aad2d8d9
MD5 feb5456aee4be26ec7d08e19daed640f
SHA1 87d39c95bd055f593e9ba25ca46aa6b039c79a9c
SHA512 14a9d2946e81d08b41797c7142ad48105d9ebd4892d82c5a7b0bd7bd7ee9030fccac43dc2ab658ce4ea1c76bc9b15e4e9e8177c7caf5e7472206a8f4b10b94d5
SSDEEP 3072:R2Iz9CI8mUOtDDPwLkBLXLDFkKmvzXBpLHYmmO1QezRd7UcPa1xMjM7g:Rjz9X8mXGUXVPmr9mOzRd7UcPKoMs
TLSH
T1B60412B0F3F98759F0A716B70831597CC97639826329237FC2885A6EAC5442FF18D764
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/716-2-0x0000000000400000-0x000000000048B000-memory.dmp

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memory/716-0-0x0000000000400000-0x000000000048B000-memory.dmp

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memory/1412-15-0x0000000000670000-0x0000000000672000-memory.dmp

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memory/1412-14-0x0000000010000000-0x0000000010052000-memory.dmp

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memory/1412-16-0x0000000010000000-0x0000000010052000-memory.dmp

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memory/1412-17-0x0000000010000000-0x0000000010052000-memory.dmp

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memory/1412-18-0x0000000010000000-0x0000000010052000-memory.dmp

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memory/1412-19-0x0000000000670000-0x0000000000672000-memory.dmp

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memory/1412-21-0x0000000010000000-0x0000000010052000-memory.dmp

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memory/1412-24-0x0000000010000000-0x0000000010052000-memory.dmp

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memory/3616-11-0x0000000000400000-0x000000000048B000-memory.dmp

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