Office (OLE) / .DOC malware analysis — malicious · 73632eaa1e787944

MALICIOUS

Office (OLE) / .DOC

80.0 KB Created: 2015-05-18 05:52:00 Authoring application: Microsoft Office Word First seen: 2022-10-05

MD5: c4f638d0f56c386c8abc1c7768ed4697 SHA-1: eb089627a47506240d40abe5b3b37fafb885e111 SHA-256: 73632eaa1e787944b0a3861e6193806c5d6c940f4baee44a3416092161937cd6

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The critical heuristic OLE_VBA_HTTP_DROP_EXEC indicates that the VBA macros download and save a file to disk. The critical heuristic OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER suggests an obfuscated auto-exec loader that uses CreateObject and Shell execution. The presence of an AutoOpen macro further supports the execution of malicious code upon opening the document. The script's intent is to download and execute a second-stage payload.

Heuristics 7

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.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
ClamAV: Doc.Macro.ObfuscatedHeuristic-5931994-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Macro.ObfuscatedHeuristic-5931994-0
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f42b93532b8632dcabe334d276df79ed4763e13c6b199681391dab06cd7ac0f5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6817 bytes

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