Office (OLE) / .XLS malware analysis — malicious · 777ae4fe2b06c018

MALICIOUS

Office (OLE) / .XLS

119.0 KB Created: 2019-07-18 19:19:14 Authoring application: Microsoft Excel

MD5: 47c01854af4f08cee8d610c51ce8d990 SHA-1: d95e1cc62f329cbf011e9a9755d3418d756a2220 SHA-256: 777ae4fe2b06c018d58304a8e8748165fbfc0bf607fbf5918e2fc1a05464ce45

320 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically upon opening. Heuristics indicate a suspicious invocation of cmd.exe, suggesting the macro is used to launch a command-line process. The ClamAV detection 'Doc.Dropper.Agent-7081746-0' further supports its malicious nature as a dropper. The document body content is obfuscated and does not provide direct clues to the lure, but the overall behavior points to a macro-based malware delivery.

Heuristics 8

ClamAV: Doc.Dropper.Agent-7081746-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-7081746-0
Suspicious cmd.exe invocation with execution flag high SC_STR_CMD

Suspicious cmd.exe invocation with execution flag
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `74e097ae74a81888a1ab2e49a9a3434909f261d81786a529fffde07781fecd48`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3717 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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