Office (OOXML) / .XLSX malware analysis — malicious · a19a0f19ccb31eac

MALICIOUS

Office (OOXML) / .XLSX

111.6 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 847ed72a4a58ab3594c36aee1221f4d9 SHA-1: 5ec2643c2e35c07b5275f624a80ab922c10493c1 SHA-256: a19a0f19ccb31eac8351ed73abada8137e28d2e1d242e642ca35c965eca4e7f4

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open macro, which is a common technique for initial execution. The macro contains obfuscated VBScript-like commands that attempt to create and execute batch and VBScript files from the \programdata\ directory. The script also attempts to download payloads from multiple URLs, including 'http://reumatiismlinic.com/./scCnm3mbJRpsaBKbbrC/', 'https://shodmanjar.com/wp-admin/xJE4P3d3N/', and others. The presence of these commands and download attempts strongly suggests the file's purpose is to download and execute a second-stage payload.

Heuristics 6

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

ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `81697da7dc56b8018ae8b5f7586fd00be0a07f89366c90ca3c507862526c4542`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 bytes
Detection ClamAV: Doc.Malware.Valyria-10004384-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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