Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5514af5888b5be71…

MALICIOUS

Office (OOXML)

7.6 KB
MD5: 0466daf209e71066dec6f52b059b1b6e SHA-1: dbb0356d8153302df096cd1ef3757fef8c205a89 SHA-256: 5514af5888b5be71d75591dcfe8a61aadc43790627a92962482275a32fa28e5d
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains a VBA macro with an Auto_Open subroutine that is triggered upon opening the document. This macro uses GetObject to interact with WMI, specifically to create a new process. The script reconstructs the URL "https://updatewin32.xyz/office365/msg.txt" from concatenated strings and uses it to download and execute a second-stage payload. This indicates a downloader functionality, likely delivered via spearphishing.

Heuristics 6

  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
929f6f0f779f93bdc6bfdbdf9b8cf5d2c37e4b576c9f1bb0a6547f4fa1dbcf1c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 341 bytes
vbaProject_00.bin
a81e80e7f112f1abe0e2cbe17b67ac67bd468e19f39bdff639bce7fc9e3c6792		 vba-project OOXML VBA project: ppt/vbaProject.bin 14848 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.