Office (OLE) / .XLSX malware analysis — malicious · e1878d83c6185944

MALICIOUS

Office (OLE) / .XLSX

145.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 79b808ddb35e11c0d3c283d217f3bbea SHA-1: 8a365dca641f58a7f4ea68076f4e49a11a5cecf3 SHA-256: e1878d83c6185944484149b105c6a10dd9eab222ffddc37dc4bc394a505d5474

280 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is a macro-enabled Excel file that triggers a Workbook_Open event. This event executes a series of commands using Windows Script Host (wscript.exe) and the command shell. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://reumatiSclinic.com/-/scCnm3mbJRpsBKBbrC/' and 'https://shodmanjar.com/wp-admin/xjEmK4Pd3N/'. The presence of 'CreateObject' and 'Scripting.FileSystemObject' further indicates malicious intent to manipulate the file system and execute arbitrary code. The ClamAV detection 'Doc.Malware.Valyria-10004384-0' strongly suggests a known malware family, but specific attribution is not possible from the provided data.

Heuristics 7

ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open 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.
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` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7821 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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