mirror of
https://github.com/malwarefrank/dnfile
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malwarefrank
48 lines
1.5 KiB
Python
Executable File
48 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Iterate UserStrings and display one per line.
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import sys
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import dnfile
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def show_strings(fname):
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# parse .NET executable
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dn = dnfile.dnPE(fname)
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# if no CLR data found, do nothing
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if not hasattr(dn, "net") or not hasattr(dn.net, "metadata") or not hasattr(dn.net.metadata, "streams"):
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return
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# get the (first) UserStrings stream
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us: dnfile.stream.UserStringHeap = dn.net.metadata.streams.get(b"#US", None)
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if us:
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# get size of the stream
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size = us.sizeof()
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# First entry (first byte in stream) is empty string, so skip it
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offset = 1
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# while there is still data in the stream
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while offset < size:
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# check if we are at padding bytes near end of stream
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if offset + 4 >= size:
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if b"\x00" == dn.get_data(us.rva + offset, 1):
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break
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# read the raw string bytes, and provide number of bytes read (includes encoded length)
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item = us.get(offset, errors="surrogatepass")
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if item is None:
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print(f"{fname} :: Bad string: offset=0x{offset:08x}")
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break
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if item.value is None:
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print(f"{fname} :: Bad string: {item.raw_data}")
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else:
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# display the decoded string
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print(f"{fname} :: {item.flag} :: {item.value}")
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# continue to next entry
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offset += item.raw_size
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# for each filepath provided on command-line
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for fname in sys.argv[1:]:
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show_strings(fname)
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