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from common import RostTestClass
from pychrysalide.analysis.contents import MemoryContent
class TestRostScanningStrings(RostTestClass):
"""TestCases for the bytes section syntax (strings)."""
def testSimpleStringPattern(self):
"""Test a simple string pattern."""
cnt = MemoryContent(b'123-Abc-456')
rule = '''
rule test {
bytes:
$a = "Abc"
condition:
#a == 1 and @a[0] == 4
}
'''
self.check_rule_success(rule, content=cnt)
def testEscapedStringPattern(self):
"""Test escaped string patterns."""
cnt = MemoryContent(b'\a\b\t\n\v\f\r' + bytes([ 0x1b ]) + b'"\\\xff')
rule = r'''
rule test {
bytes:
$a = "\a\b\t\n\v\f\r\e\"\\\xff"
condition:
#a == 1 and @a[0] == 0
}
'''
self.check_rule_success(rule, content=cnt)
cnt = MemoryContent(b'\a\b\t\n--123--\v\f\r' + bytes([ 0x1b ]) + b'"\\\xff')
rule = r'''
rule test {
bytes:
$a = "\a\b\t\n--123--\v\f\r\e\"\\\xff"
condition:
#a == 1 and @a[0] == 0
}
'''
self.check_rule_success(rule, content=cnt)
def testStringModifiers(self):
"""Check string modifiers output."""
cnt = MemoryContent(b'--414243--')
rule = '''
rule test {
bytes:
$a = "ABC" hex
condition:
#a == 1
}
'''
self.check_rule_success(rule, content=cnt)
cnt = MemoryContent(b'--ABC--')
rule = '''
rule test {
bytes:
$a = "ABC" plain
condition:
#a == 1
}
'''
self.check_rule_success(rule, content=cnt)
cnt = MemoryContent(b'--CBA--')
rule = '''
rule test {
bytes:
$a = "ABC" rev
condition:
#a == 1
}
'''
def testStringPatternFullword(self):
"""Test a fullword string pattern."""
cnt = MemoryContent(b'ABCDEF 123 ')
rule = '''
rule test {
bytes:
$a = "DEF" fullword
$b = "123" fullword
condition:
#a == 0 and #b == 1
}
'''
self.check_rule_success(rule, content=cnt)
cnt = MemoryContent(b'DEF 123 ')
rule = '''
rule test {
bytes:
$a = "DEF" fullword
$b = "123" fullword
condition:
#a == 1 and #b == 1
}
'''
self.check_rule_success(rule, content=cnt)
cnt = MemoryContent(b'\tDEF 123 ')
rule = '''
rule test {
bytes:
$a = "DEF" fullword
$b = "123" fullword
condition:
#a == 1 and #b == 1
}
'''
self.check_rule_success(rule, content=cnt)
def testStringPatternCase(self):
"""Test a string pattern with case care."""
cnt = MemoryContent(b'abc123-Abc123Def456GHI...z0z1z2z3z4z5z6z7z8z9')
rule = '''
rule test {
bytes:
$a = "Abc" nocase
$b = "ABC123DEF456GHI" nocase
$z = "z0z1z2z3z4z5z6z7z8z9" nocase
condition:
#a == 2 and #b == 1 and #z == 1
}
'''
self.check_rule_success(rule, content=cnt)
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