Office (OLE) / .DOC malware analysis — malicious · 43a263188928226e

MALICIOUS

Office (OLE) / .DOC

92.0 KB Created: 2017-06-01 17:12:00 Authoring application: Microsoft Office Word First seen: 2022-04-15

MD5: 3f44f7070c2e944e01fc1687c4412574 SHA-1: c9db1ee29f3bf55a3980a83b37c61a9422410af6 SHA-256: 43a263188928226e26bb33107f33d548de8d8a77ed5796d1e9d31695843d2dc3

402 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a Microsoft Office document containing VBA macros, specifically triggering AutoOpen and Document_Open events. Heuristics indicate the use of CreateObject and CallByName, common for executing downloaded payloads. The ClamAV detection 'Doc.Downloader.Jaff-6329915-0' strongly suggests a downloader family. The extracted 'macros.bas' file is the primary artifact associated with this malicious behavior, likely responsible for fetching and running a secondary stage.

Heuristics 11

ClamAV: Doc.Downloader.Jaff-6329915-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Jaff-6329915-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
CallByName call high OLE_VBA_CALLBYNAME

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5d34e9d1f6397afd90e98fed7f8111f532a7f5aca11b838fe4f7477c77155ad4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11603 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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