Office (OOXML) / .XLSM malware analysis — malicious · b89d78f3c014f12a

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 79e8d75d3d0230f33380b9bd7f023e07 SHA-1: 969e7f929c51ad96096f3d357af22105a7e6ba99 SHA-256: b89d78f3c014f12a66595435872b1e02bcdb459681658d4d94dfb34afbbd49b7

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1027 Obfuscated Files or Information

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro that executes obfuscated commands. The DOC BODY and script analysis reveal attempts to create and execute batch and VBScript files from the ProgramData directory. The script also reconstructs multiple URLs, indicating a downloader or droppper functionality. The primary intent appears to be downloading and executing a second-stage payload from the identified URLs.

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` `64f8b52981f3de85efce408cd2ed07f9dcb8da273127367acd209346aa0f263b`	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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