Office (OLE) / .PPT malware analysis — malicious · 0a8fc1c8d001a854

MALICIOUS

Office (OLE) / .PPT

88.0 KB Created: 2020-11-25 19:56:46 Authoring application: Microsoft Office PowerPoint

MD5: c9c7fdebc72834695b285c54ea111649 SHA-1: 73d9a827cc0c8df0a68ffcab383fe7af8b58f149 SHA-256: 0a8fc1c8d001a85409691ab12182de4b0fcfe16d589dc097d49191013779d95b

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The PowerPoint file contains obfuscated VBA macros designed to execute a command. The Auto_Close macro, triggered when the presentation is closed, uses character-shift decoding to construct and execute a command via Shell(). The reconstructed URL 'tp://%748237%728748%728748%728748%728748%728748%728748%728748%728748@j.mp/' is likely used to download and execute a second-stage payload. The presence of Shell() calls and character-shift decoding strongly indicates malicious intent.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
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.Malware.Valyria-10008087-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10008087-0
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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.
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` `227f8605d8a3cdf2e922ddb414c926a3a0bb5dfe81716ac1c542a6bfe366a27e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4492 bytes

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