MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 524a2c7a97d8323f5de3ca9ba3190e372d6f6e076522283a9697324d94ffcd38. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.
Database Entry
QuasarRAT
Vendor detections: 11
Maldoc score: 25
| SHA256 hash: | 524a2c7a97d8323f5de3ca9ba3190e372d6f6e076522283a9697324d94ffcd38 |
|---|---|
| SHA3-384 hash: | d479eaaba9eb6e11b371a17a002936a7ee60525fe43f4a8590eed0ce2ec57b5210843640b69f1f96c0a7c1395e39649f |
| SHA1 hash: | a9372f041ad8e773e62b7708d5e4302c276964df |
| MD5 hash: | 9e1035f36da93aa7089f12702c221c05 |
| humanhash: | aspen-juliet-low-timing |
| File name: | Pago.Diciembre.xls |
| Download: | download sample |
| Signature | QuasarRAT |
| File size: | 172'032 bytes |
| First seen: | 2021-12-31 06:27:08 UTC |
| Last seen: | 2021-12-31 09:21:56 UTC |
| File type: |  xls |
| MIME type: | application/vnd.ms-excel |
| ssdeep | 3072:UTxEtjPOtioVjDGUU1qfDlaGGx+cL2QnAXi4VYhP7QSuNDxEVbuHsQn2KsO37KDa:mxEtjPOtioVjDGUU1qfDlavx+W2QnASo |
| TLSH | T155F3BE927681C855D98807320CE6D2D63B23FD519FBA878B31A4F71E2E77790CA4261B |
| Reporter |  abuse_ch |
| Tags: | QuasarRAT xls |
Office OLE Information
This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.
OLE id
| Maldoc score: 25 |
OLE dump
MalwareBazaar was able to identify 17 sections in this file using oledump:
| Section ID | Section size | Section name |
|---|---|---|
| 1 | 107 bytes | CompObj |
| 2 | 244 bytes | DocumentSummaryInformation |
| 3 | 204 bytes | SummaryInformation |
| 4 | 137725 bytes | Workbook |
| 5 | 643 bytes | _VBA_PROJECT_CUR/PROJECT |
| 6 | 128 bytes | _VBA_PROJECT_CUR/PROJECTwm |
| 7 | 816 bytes | _VBA_PROJECT_CUR/VBA/Module1 |
| 8 | 1001 bytes | _VBA_PROJECT_CUR/VBA/Sheet1 |
| 9 | 977 bytes | _VBA_PROJECT_CUR/VBA/Sheet2 |
| 10 | 977 bytes | _VBA_PROJECT_CUR/VBA/Sheet3 |
| 11 | 10134 bytes | _VBA_PROJECT_CUR/VBA/ThisWorkbook |
| 12 | 7790 bytes | _VBA_PROJECT_CUR/VBA/_VBA_PROJECT |
| 13 | 1992 bytes | _VBA_PROJECT_CUR/VBA/__SRP_0 |
| 14 | 365 bytes | _VBA_PROJECT_CUR/VBA/__SRP_1 |
| 15 | 616 bytes | _VBA_PROJECT_CUR/VBA/__SRP_2 |
| 16 | 832 bytes | _VBA_PROJECT_CUR/VBA/__SRP_3 |
| 17 | 618 bytes | _VBA_PROJECT_CUR/VBA/dir |
OLE vba
MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:
| Type | Keyword | Description |
|---|---|---|
| AutoExec | Workbook_Open | Runs when the Excel Workbook is opened |
| IOC | shell32.dll | Executable file name code and P-code are different, this may have been used to hide malicious code |
| Suspicious | Environ | May read system environment variables |
| Suspicious | open | May open a file |
| Suspicious | SaveToFile | May create a text file |
| Suspicious | vbNormalFocus | May run an executable file or a system command |
| Suspicious | ShellExecuteA | May run an executable file or a system command |
| Suspicious | shell32 | May run an executable file or a system command |
| Suspicious | Lib | May run code from a DLL |
| Suspicious | URLDownloadToFileA | May download files from the Internet |
| Suspicious | Chr | May attempt to obfuscate specific strings (use option --deobf to deobfuscate) |
| Suspicious | StrReverse | May attempt to obfuscate specific strings (use option --deobf to deobfuscate) |
| Suspicious | Hex Strings | Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
| Suspicious | Base64 Strings | Base64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all) |
Intelligence
File Origin
# of uploads :
2
# of downloads :
294
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Pago.Diciembre.xls
Verdict:
Malicious activity
Analysis date:
2021-12-31 06:31:05 UTC
Tags:
macros macros-on-open evasion trojan
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Result
Verdict:
Malware
Maliciousness:
Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Creating a file in the %temp% directory
Launching a process
Creating a process with a hidden window
Sending an HTTP GET request
Unauthorized injection to a recently created process
Sending a custom TCP request by exploiting the app vulnerability
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
Legacy Excel File with Macro
Document image
Image:
Verdict:
Malicious
Threat level:
10/10
Confidence:
80%
Tags:
evasive macros macros-on-open valyria vbastomped
Result
Verdict:
MALICIOUS
Link:
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Macro with DLL Reference
Detected macro logic that will load additional functionality from Dynamically Linked Libraries (DLLs). While not explicitly malicious, this is a common tactic for accessing APIs that are not otherwised exposed via Visual Basic for Applications (VBA).
Document With Minimal Content
Document contains less than 1 kilobyte of semantic information.
Result
Threat name:
Quasar
Detection:
malicious
Classification:
expl.evad.bank.troj
Score:
100 / 100
Signature
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
C2 URLs / IPs found in malware configuration
Connects to many ports of the same IP (likely port scanning)
Document contains an embedded VBA macro which may execute processes
Document contains an embedded VBA macro with suspicious strings
Document contains VBA stomped code (only p-code) potentially bypassing AV detection
Document exploit detected (creates forbidden files)
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Encrypted powershell cmdline option found
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious encrypted Powershell command line found
Malicious sample detected (through community Yara rule)
May check the online IP address of the machine
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office process drops PE file
Sigma detected: MS Office Product Spawning Exe in User Dir
Sigma detected: Suspicious Encoded PowerShell Command Line
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Threat name:
Document-Word.Trojan.Valyria
Status:
Malicious
First seen:
2021-12-30 12:13:14 UTC
File Type:
Document
Extracted files:
26
AV detection:
23 of 43 (53.49%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
n/a
Score:
8/10
Tags:
macro macro_on_action
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Office loads VBA resources, possible macro or embedded object present
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Malspam
Delivery method
Distributed via e-mail attachment
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