Office (OLE) / .XLS malware analysis — malicious · aa433f11eb1342b5

MALICIOUS

Office (OLE) / .XLS

167.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: e2a4e6ae9fc4de5fb015b4bc3533bdfc SHA-1: a7482537b4404f87a4c939972bf40714c699c99b SHA-256: aa433f11eb1342b56cd91527170edb7e1499dadc2ff431f18594a0538ff6ad17

368 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains a Workbook_Open VBA macro that utilizes the URLDownloadToFileA API to download a payload from a remote source. The macro also contains a ShellExecuteA call, indicating it will likely execute the downloaded content. The ClamAV signature 'Xls.Malware.Valyria-10028013-0' further supports its malicious nature. The script's intent is to download and execute a second-stage payload.

Heuristics 9

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Xls.Malware.Valyria-10028013-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10028013-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `1a75561c7b4dd838475aa68fc2fb883dbbc171534046c7ca8c6bce66459f5c3a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	25697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 19 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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