Office (OLE) / .XLSX malware analysis — malicious · d5d8cca33368d72e

MALICIOUS

Office (OLE) / .XLSX

33.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16

MD5: 7a115715d7ff051cdc0a008521e2c35e SHA-1: 34e5ceddef13f16f6f5ee775c198b5cf76552b55 SHA-256: d5d8cca33368d72e3d58ea71e3b4984f336d93b21af1c896141635961a0d777d

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1059.005 Visual Basic T1204.002 Malicious File

The Workbook_Open macro is designed to execute a batch script named Outlook.bat. This script, in turn, appears to be responsible for downloading and executing a second-stage payload, likely a PowerShell script, from the IP address 185.143.223.175. The use of Environ() to construct paths and the direct call to cmd.exe via Shell() are strong indicators of malicious intent.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9aae994c2e1c1317470f797f5379b50ed17f44f406e21538b812f3b5e27660ed`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5486 bytes

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