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3.3. JSON reports
PE-sieve creates 2 JSON reports:
-
Scan report (
scan_report.json)- Provides a summary of the scans that have been performed on the process, and what type of anomalies they detected.
- Contains reports from each scan that ended up detecting anomalies. Possible scans:
-
Dump report (
dump_report.json)- Provides details on in which form the artifacts has been dumped.
The scan report is divided on segments. First comes the general summary from all scans. Example:
{
"pid" : 684, // PID of the process that was scanned
"is_64_bit" : 1, // Flag indicating if the process was 64 bit: 1 if true, 0 if false
"is_managed" : 0, // Flag indicating if the process was managed (.NET) : 1 if true (.NET process) , 0 if false (native process)
"main_image_path" : "", // The path of the main image (from PEB). If empty, it often indicates process Doppelgänging.
"scanned" :
{
"total" : 48, // total count of scanned modules
"skipped" : 0, // count of modules excluded from the scan, for example:
// excluded on demand by the parameter: /mignore <module>
"modified" : // list of all the modules in which any of the suspicious indicators were detected
{
"total" : 2, // total count of modules detected as suspicious
"patched" : 0, // count of modules detected as patched (possible inline hooks or other code modifications)
"iat_hooked" : 0, // count of modules where IAT hooks were detected
"replaced" : 1, // count of hollowed/replaced modules
"hdr_modified" : 0, //count of modules with PE headers modified (but without modifications typical for replaced modules)
"implanted_pe" : 0, // count of manually mapped PEs (not associated with any PE file on the disk)
"implanted_shc" : 0, // count of sections with code mapped outside of any PE (shellcodes, JITs)
"unreachable_file" : 0, // count of modules that were associated with a PE file on the disk, but
// this file was deleted or inaccessible
"other" : 1 // any additional indicators - such as
// inconsistency between the path of mapped module and corresponding path set in the PEB
},
"errors" : 0 // count of inconclusive scans, interrupted by some errors
},
[...]After the general summary, we have a list of reports for particular scans that gave the suspicious indicators. Example:
"scans" : [ // list of the reports from particular scans
{
"mapping_scan" : {
"module" : "7ff6bc950000",
"module_file" : "C:\\Windows\\notepad.exe",
"mapped_file" : "",
"status" : 1
}
},
{
"headers_scan" : {
"module" : "7ff6bc950000",
"module_file" : "C:\\Windows\\notepad.exe",
"status" : 1,
"is_pe_replaced" : 1,
"dos_hdr_modified" : 1,
"file_hdr_modified" : 1,
"nt_hdr_modified" : 1,
"ep_modified" : 1,
"sec_hdr_modified" : 1
}
}
]Scan checking consistency between the path that was mapped, and the path set in PEB. In a normal situation they both should point to the same file.
"mapping_scan" : { // report from the mapping scan
"module" : "7ff6bc950000", // the base address at which the module was mapped in the memory
"module_file" : "C:\\Windows\\notepad.exe", // The path set in the PEB
"mapped_file" : "", // The path from which the module was mapped. If empty, it often indicates process Doppelgänging.
"status" : 1 // status 1 - means positive result (suspicious)
}
Scan checking consistency between the PE header mapped in memory, and header from a corresponding file on the disk.
"headers_scan" : { // report from the headers scan
"module" : "7ff6bc950000", // the base address at which the module was mapped in the memory
"module_file" : "C:\\Windows\\notepad.exe", // The path corresponding to the module (for informational purposes)
"status" : 1, // status 1 - means positive result (suspicious)
"is_pe_replaced" : 1, // Flag indicating if the PE was detected as replaced - completely different than corresponding file on the disk
"dos_hdr_modified" : 1, // Flag indicating if the differences were detected in DOS headers of both PEs:
// 1 if true (different) , 0 if false (same)
"file_hdr_modified" : 1, // Flag indicating if the differences were detected in File headers of both PEs
"nt_hdr_modified" : 1, // Flag indicating if the differences were detected in NT headers of both PEs
"ep_modified" : 1, // Flag indicating if the Entry Point differs in both PEs
"sec_hdr_modified" : 1 // Flag indicating if the differences were detected in Section Headers of both PEs
}Sometimes the modifications in the headers are subtle, and they do not indicate a replacement of the full PE. That's why the flag is_pe_replaced helps to easily filter out when the PE was really replaced/hollowed.
Scan checking consistency between the code section(s) of the PE mapped in memory, and corresponding sections from a file on the disk.
"code_scan" : { // report from the code scan
"module" : "75660000", // the base address at which the module was mapped in the memory
"module_file" : "C:\\Windows\\SysWoW64\\user32.dll", // The path corresponding to the module (for informational purposes)
"status" : 1, // status 1 - means positive result (suspicious)
"patches" : 2, // how many patches are detected
"scanned_sections" : 1 // how many sections in the PE were detected as code sections, and scanned for patches
}If this scan detected some patches, the full list of them will be dumped as a file with .tag extension. This file can be loaded to other analysis tools, and used for investigating of hooks and patches.
This scan is optional, performed only with the parameter /iat
Scan checking consistency between the addresses filled with IATs and the addresses of the imported functions. It detects IAT hooks, as well as imports shimming.
"iat_scan" : { // report from the IAT scan
"module" : "400000", // the base address at which the module was mapped in the memory
"module_file" : "C:\\Users\\tester\\Desktop\\cm_hooked\\hooked2.exe", // The path corresponding to the module (for informational purposes)
"status" : 1, // status 1 - means positive result (suspicious)
"hooks" : 1 // how many IAT records have been replaces
}If this scan detected some modifications, the full list of them will be dumped to a separate report, helpful in investigating the details of the hook.
Scan checking workingset against manually mapped (potentially implanted) PE files and related artifacts.
If the parameter /shellc was used, it additionally detects sections with code mapped outside of any PE (shellcodes, JITs).
//TODO
While the scan report gives details about the results of the scans, dump report describes the material that was dumped.
Example:
{
"pid" : 684, // PID of the process that was scanned
"output_dir" : "process_684", // The directory where the output from the process was saved
"dumped" : // summary of the dumped modules
{
"total" : 2, // total count of the modules supposed to be dumped
"dumped" : 2 // count of the module that were dumped successfully
},
"dumps" : [ // reports about each dumped module
{
"module" : "7ff6bc950000", // the base address at which the module was mapped in the memory
"module_size" : "e4000", // the size of the module
"dump_file" : "7ff6bc950000.notepad.exe", // the file under which the dumped module was saved
"dump_mode" : "UNMAPPED", // Mode in which the module was dumped.
// Possible modes can be listed by a parameter: /dmode ?
"is_shellcode" : 0, // Flag indicating if the dumped component was a shellcode :
// 1 if true (shellcode) , 0 if false (PE)
"status" : 1 // Flag indicating if the module was dumped successfully
},
[...]
]
}
If some additional material was dumped, the dump report may contain more fields. For example:
"dumps" : [
{
"module" : "75660000",
"module_size" : "153000",
"dump_file" : "75660000.user32.dll",
"tags_file" : "75660000.user32.dll.tag", // the tag file where the details about patches have been saved
"dump_mode" : "UNMAPPED",
"is_shellcode" : 0,
"status" : 1
}