Office (OLE) / .XLS malware analysis — malicious · 13b52a2b81a99c5b

MALICIOUS

Office (OLE) / .XLS

120.5 KB Created: 2023-04-09 18:58:33 Authoring application: Microsoft Excel First seen: 2023-04-10

MD5: 370a5cdc63cfc46e1e22f48b550b3ae0 SHA-1: 15708709e2af12b8d448eb75c2a48957e9e5fe11 SHA-256: 13b52a2b81a99c5b40e1710dc68c74726cb5981676cb52585a218e696cc2846e

330 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro is configured to execute automatically upon opening the Excel file. It utilizes the URLDownloadToFile API to download a payload from a remote source, likely for further execution. The presence of ShellExecute API calls further suggests the execution of downloaded or embedded code.

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.
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)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `4272c498c1b0c479481a64289054233d05b9a033fcad17b54344381f58043d46`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	31805 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 long base64-like blob(s).

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