## Summary

**File:** `a344eab689251264b208fabbbf23c7d12e652e9b372957af916446142398c382` **#AID=198#**

1. **Generic info**
   - Type: ELF executable **#AID=198#**
   - Architecture: ARMV7 / ARM hard-float userspace indicators **#AID=198#**
   - Size: 937,176 bytes **#AID=198#**
   - SHA-256: `a344eab689251264b208fabbbf23c7d12e652e9b372957af916446142398c382`
   - Interpreter: `/lib/ld-linux-armhf.so.3`
   - Dynamic library references include `libc.so.6`, `GLIBC_2.4`, `GLIBC_2.27`, `GLIBC_2.28`.
   - Kesakode verdict: no verdict returned.
   - The file contains clear BusyBox identifiers:
     - `BusyBox v1.20.2 (2019-06-02 23:36:03 HKT)`
     - GPL BusyBox usage/help text.
     - BusyBox applet names such as `wget`, `httpd`, `telnetd`, `tftp`, `tftpd`, `ftpget`, `passwd`, `chpasswd`, `mkpasswd`.

2. **Inferred behavior**
   - The sample **#AID=198#** appears to be a BusyBox multi-call binary for ARM Linux systems.
   - It bundles many standard Unix/Linux utilities into one executable, including shell, networking, filesystem, process-control, system-administration, and service applets.
   - Observed networking-related functionality includes HTTP server/client strings, wget-style POST form handling, TFTP/FTP applets, telnet server support, socket APIs, and CGI/httpd strings. These are consistent with a full BusyBox build.
   - No hardcoded external C2 domain, suspicious URL, attacker IP, persistence path, credential, or malware-specific command string was identified during triage.

3. **Sub-files**
   - No virtual files were listed for **#AID=198#**.
   - No carved files were found inside **#AID=198#**.

## Key detections/IOCs

### IOCs

No clear malware IOCs were extracted from **#AID=198#**.

Notable but non-malicious contextual strings:
- `BusyBox v1.20.2 (2019-06-02 23:36:03 HKT)`
- `/lib/ld-linux-armhf.so.3`
- `libc.so.6`
- `SERVER_SOFTWARE=busybox httpd/1.20.2`
- `/cgi-bin/index.cgi`
- `/etc/busybox.conf`
- `/etc/passwd`
- `/etc/network/interfaces`
- `/dev/net/tun`
- `127.0.0.1`
- `255.255.255.255`

### Key detections

Potentially security-relevant findings in **#AID=198#**:
- Yara rule `PostHttpForm`, category `network`, type `UNCOMMON`, reliability 70.
  - Matched string: `Content-Type: application/x-www-form-urlencoded\r\nContent-Length: %u\r\n\r\n%s`
  - This is consistent with BusyBox `wget`/HTTP client behavior and is not sufficient evidence of malware.
- Yara rule `Zlib`, category `library`, type `INFO`, reliability 80.
  - Consistent with compression support in BusyBox utilities.
- Imports include sensitive system APIs such as `execve`, `system`, `fork`, `socket`, `connect`, `bind`, `listen`, `accept`, `init_module`, `delete_module`, `mount`, `chroot`, `setuid`, `setgid`, and `reboot`.
  - These APIs are expected in a comprehensive system utility binary like BusyBox.
- Anomalies include `XorInLoop`, crypto/compression constants, and “spaghetti”/looping functions.
  - Given the BusyBox context, these are plausibly caused by bundled implementations of compression, hashing, encoding, shell, and utility code rather than obfuscation.

## Evidence

### BusyBox identity

The strongest evidence for benign classification is that **#AID=198#** contains standard BusyBox metadata and help text:

- Full BusyBox usage/help text:
  - `Usage: busybox [function] [arguments]...`
  - `BusyBox is a multi-call binary that combines many common Unix utilities into a single executable...`
- Version string:
  - `BusyBox v1.20.2 (2019-06-02 23:36:03 HKT)`
- BusyBox configuration path:
  - `/etc/busybox.conf`
- BusyBox HTTP server identifier:
  - `SERVER_SOFTWARE=busybox httpd/1.20.2`

These strings strongly indicate that **#AID=198#** is a BusyBox build rather than a custom malware payload.

### Networking functionality

The sample **#AID=198#** contains networking strings and imports:
- Applets/strings: `wget`, `httpd`, `telnetd`, `tftp`, `tftpd`, `ftpget`
- HTTP-related strings:
  - `http://`
  - `Accept-Encoding:`
  - `Content-Encoding: gzip`
  - `Content-Type: application/x-www-form-urlencoded`
  - `SERVER_SOFTWARE=busybox httpd/1.20.2`
- Socket imports include `socket`, `connect`, `bind`, `listen`, `accept`, `send`, `recv`, `sendto`, `recvfrom`.

These capabilities could be abused if used by malware, but they are normal for BusyBox builds that include network applets.

### Code inspection

- Entry point of **#AID=198#** decompiles as a standard libc startup wrapper calling `__libc_start_main`.
- An inspected function referencing the HTTP POST-form string appears to belong to HTTP/client/server-related code and was categorized as `CLEAN` by the tool.
- Another inspected function around BusyBox applet handling showed logic consistent with BusyBox command/app applet dispatch/install behavior, including effective UID checks and applet-related argument handling.
- No inspected code showed clear malware behavior such as downloading a second-stage payload from a fixed C2, process injection, credential theft, destructive wiping, or botnet command parsing.

### Counterarguments / limitations

- BusyBox is often included inside IoT malware packages as a utility dependency. However, this file **#AID=198#** itself does not show embedded malicious scripts, C2s, droppers, or packed payloads.
- The presence of `telnetd`, `wget`, `tftp`, `ftpget`, and privileged system APIs may look suspicious in isolation, but these are normal BusyBox applets/features.
- Some code anomalies such as `XorInLoop` and crypto/compression constants were reported, but BusyBox includes compression, hashing, base64, archive, and networking code that can naturally produce these detections.
- Decompilation quality for some ARM/PIC functions was imperfect, so this assessment is based on static triage evidence rather than full source-level reconstruction.

## Verdict

**Final verdict for #AID=198#: Likely clean / benign BusyBox ARM executable.**

The sample appears to be a standard BusyBox multi-call binary for ARM Linux, not standalone malware. Network and privileged system functionality are present, but they align with BusyBox’s expected feature set. No concrete malicious IOCs, embedded payloads, or malware-specific behavior were identified.

**Confidence: 85%**