Office (OLE) / .XLS malware analysis — malicious · cad13976386d248b

MALICIOUS

Office (OLE) / .XLS

146.5 KB Created: 2020-04-28 09:33:49 Authoring application: Microsoft Excel

MD5: 4487a64dfc32d153ef7369aaaec1d8ec SHA-1: 4dc4d15fa655dc1f5ec59b27cc220722ff10bbc8 SHA-256: cad13976386d248b27f3b016f1889fd6c90479b00e14233a2d7aae6410ea7e84

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLS file contains a Workbook_Open VBA macro that utilizes character-shifting functions (Asc, Chr, Mid) to decode and execute a command via the Shell() function. The macro is designed to auto-execute upon opening the workbook. While the exact command is obfuscated, the presence of Shell() and the auto-execution trigger strongly suggest it's a downloader for a second-stage payload. No specific family could be identified from the available heuristics.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `dcc85ffb00adbc431f9ffde81a6c7fd0eeed1a9763de152cd49b09cf4abadf35`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1884 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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