Office (OOXML) / .XLSM malware analysis — malicious · d07abcb27068e4e0

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 46b0e8a206d5cfe955f23a0f799428cb SHA-1: f530d5a74e7ab153d1db29f6692baa6ab989ff6f SHA-256: d07abcb27068e4e0552e3ca69d1ad1c9cf4ef94e9c70acbaf590f1c6f61bbe08

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for malware. The DOC BODY and extracted VBA script reveal obfuscated commands that attempt to download and execute a second-stage payload from multiple URLs. The script reconstructs the following URLs: http://reumatismclinic.com/--/scCnm3mbJBrpBqBrc/, https://shodmanjar.com/wp-admin/xJE4P3d3N/, http://tubelocal.net/wp-admin/X4Xm4MQk/, https://pacifichomebroker.com/roderick/RRk/, and https://molinai-journal.com/roderick/RRk/. It also attempts to create batch and VBScript files in the programdata directory. The ClamAV detection further confirms its malicious nature.

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` `6d4727d6b45f0bcb200c6bf2c2471d47bf2fe8e584fdd081ff0e0cd722c3dbfe`	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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