Office (OLE) / .DOC malware analysis — malicious · 7977ee7a05a814e7

MALICIOUS

Office (OLE) / .DOC

143.5 KB Created: 2025-01-07 09:22:00 Authoring application: Microsoft Office Word

MD5: 3aa187a17e25bd67e3026b0e064fd308 SHA-1: 6edae74a7702bd0e0f346973f20fadb6498f57a0 SHA-256: 7977ee7a05a814e726e1b6e9d1747ff3ad84495d15a45d3f5ca59d20a9e8d383

322 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a Microsoft Word document containing VBA macros. The AutoOpen macro executes a Shell() call after downloading a file from the reconstructed URL 'http://87.120.113.91/image.exe'. The downloaded file is saved as 'brightness.exe' and then executed. This indicates a downloader pattern designed to fetch and run a second-stage payload.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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 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 http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b6a66d5f5a37911a77b287362e965dcdadca52b95d99b480ec5b0cb5a8605e1a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1768 bytes

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