Office (OLE) / .XLS malware analysis — malicious · 99e70bf7828d4ea2

MALICIOUS

Office (OLE) / .XLS

95.0 KB Created: 2020-05-01 10:15:44 Authoring application: Microsoft Excel

MD5: 602b1da2849eaa8e98b999052ea9e63e SHA-1: ddc0447a7110ec6b3e24db41d7375ac535d1e35c SHA-256: 99e70bf7828d4ea2ac36be439c1dcdb64c1810c860a17ae696999cb7f70c642c

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that is auto-executed upon opening. The document body prompts the user to 'Enable content to display this transaction SWIFT', indicating a social engineering lure. The Workbook_Open macro utilizes URLDownloadToFile, suggesting it downloads a second-stage payload. The presence of a 'macros.bas' artifact further supports this. The ClamAV detection 'Xls.Dropper.Agent-7742194-0' also points to a dropper functionality.

Heuristics 10

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Xls.Dropper.Agent-7742194-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-7742194-0
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
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` `36506bce640f4aeb01737bd3a76f4c46097cb6358eaf5a4b14a80546816443e9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	54190 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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