Office (OLE) / .PPT malware analysis — malicious · 538724d1b23ad692

MALICIOUS

Office (OLE) / .PPT

60.5 KB Created: 2023-01-19 03:44:48 Authoring application: Microsoft Office PowerPoint

MD5: a19387c55e33a283551bb0014ecd00bf SHA-1: df140b832ab7c919081713e59a2ec5b4a97b5988 SHA-256: 538724d1b23ad692914a6b40ce8dc4a40c74329c3932af54e9e02039e4461eb7

380 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is a PowerPoint file containing a malicious VBA macro. The macro is triggered by the Auto_Open function and uses the URLDownloadToFile API to download a second-stage payload from the embedded URL. The downloaded payload is then executed using the Shell() function. The obfuscated nature of the shell command and the use of URLDownloadToFile indicate a downloader pattern.

Heuristics 9

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL https://share.getcloudapp.com/z8ulbdyr/download/document.vbs?utm_source=viewer

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `61437b5f7c9158279237ab7c60d3100c4635ef7c1de274038e01d31ecbd03371`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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