Office (OLE) / .PPT malware analysis — malicious · 745c84967a7460f3

MALICIOUS

Office (OLE) / .PPT

86.0 KB Created: 2020-11-23 19:28:22 Authoring application: Microsoft Office PowerPoint

MD5: 738c157d70c2b061ef01d8354dda28fb SHA-1: 06d5f34f8a81727bdf59812e2f4e8c93e9781a3b SHA-256: 745c84967a7460f3eb96487ef830666beb02f46f72dfde752d5c23166127e7d0

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is a PowerPoint presentation containing heavily obfuscated VBA macros. The Auto_Close macro is triggered upon closing the presentation, which then uses a custom decoder to execute a command. This command, reconstructed from concatenated strings and character manipulation, appears to be a URL that likely hosts a second-stage payload. The ClamAV detection and critical heuristic firings for obfuscated loaders and Shell() calls strongly indicate 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` `9a91ea2b3ae49ba3b84b666951c307544a5b48714a45a80bbd0fa50f36304054`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4483 bytes

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