Office (OLE) / .XLS malware analysis — malicious · d0b0ba3e32579f5c

MALICIOUS

Office (OLE) / .XLS

78.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2023-08-24

MD5: 6e17279987ed9d65519d9638c716b31e SHA-1: a157ff8eb9cf1ef96fa92c7b7c1f27d098a0f284 SHA-256: d0b0ba3e32579f5cb61b509ff0ccf5182a17e18df7154ade446ce9e1bf88a49d

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains VBA macros, including a Workbook_Open event, which is a common technique for executing malicious code upon opening the document. The script utilizes ShellExecuteA and URLDownloadToFile APIs, indicating an intent to download and execute a second-stage payload. The presence of a macro-enable lure further supports this malicious intent.

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `afa39884372e36eb8a5ef1dd7d865bc28d58d2963974a507b21cd456c2d6ee33`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	9932 bytes

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