44caliber | e20f2a6dcc54524c456a339dc0d4d6d943f115980ae3959f83c6796becdce8cd

General

Target

Release.exe
Size

586KB
MD5

5baa2d8574f45208fcefb8eef68733f5
SHA1

15fe222ddfebc44946f39be2aaf06ca1eb2f76f7
SHA256

e20f2a6dcc54524c456a339dc0d4d6d943f115980ae3959f83c6796becdce8cd
SHA512

40457ddb05cbd5bae8d8dce7dfcb5fe5e482cfe591a9cc9455a7f8c406a4c887b21fbb71ab27b1eaa1e112392f61bdb6a6729d6203c7977eaa99770c630f27c8
SSDEEP

12288:eKry2/qZXzmLT+tGHAioNRwhEGATZNjwgRcnSR/iCo2SgQ:5ry2uXzmDgio4hE3j/NR/iCjLQ

Score

10^/10

44caliber discovery spyware stealer

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/903397681865576489/e3jD3bth-gH8swR6V0ji8YeJKHIkIb51ywNDwlXFWkBcrhriQYmNx8D7F0Dm0HBXsodO

Signatures

44Caliber
An open source infostealer written in C#.
stealer 44caliber
44Caliber family
44caliber

Executes dropped EXE 1 IoCs

pid	Process
1760	Insidious.exe

Loads dropped DLL 4 IoCs

pid	Process
2284	Release.exe
2284	Release.exe
2284	Release.exe
2284	Release.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	freegeoip.app
5	freegeoip.app

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Release.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	Insidious.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Insidious.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1760	Insidious.exe
1760	Insidious.exe
1760	Insidious.exe
1760	Insidious.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1760	Insidious.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2284 wrote to memory of 1760	2284	Release.exe	31
PID 2284 wrote to memory of 1760	2284	Release.exe	31
PID 2284 wrote to memory of 1760	2284	Release.exe	31
PID 2284 wrote to memory of 1760	2284	Release.exe	31

C:\Users\Admin\AppData\Local\Temp\Release.exe
"C:\Users\Admin\AppData\Local\Temp\Release.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2284
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\Insidious.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Insidious.exe"
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1760

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

2

T1552

Credentials In Files

2

T1552.001

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\ProgramData\44\Process.txt

Filesize
435B

MD5
902d422e87de69b6d4b4f1bd150605d8

SHA1
96f892534d39d7223a252c77e8a1f5f0d0f04fcd

SHA256
4476f3280410e80de702a1ae237a15341fc88e2fc47a6dcfe649711f06adceb7

SHA512
44675778cf422aeb62d08fbc7f80d9e3b6e0f67339e71392426bbb929810cb47d6a3c587dcba4e42b4cb03378fe3d2d2a9ba00f354078aeb2d9869f58aabf8f7

Download Submit
C:\Users\Admin\AppData\Local\Temp\RarSFX0\Insidious.pdb

Filesize
865KB

MD5
8119ea02b8fbb3200391d5410f68c00b

SHA1
e163d5a3860b47444e8220f9729eefea50311504

SHA256
85a36abd25f0f94f888e05d35e60537efddc87126a49436a5dd8df09b4e92380

SHA512
18ad7d38eafb2aba37788901807e4c9c3209bfb16ebbc26b73adc0e5eb89e93a27753c8d6a4ee9fcee115c007ee2fdeaf269c68bb4f2d0b3c6bca56779a419e8

Download Submit
\Users\Admin\AppData\Local\Temp\RarSFX0\Insidious.exe

Filesize
274KB

MD5
8b472b5e0ecbe83650a22e51a202c343

SHA1
030c10259d7f0ec0400e87d8b6e1aa05adf80329

SHA256
78b08796b0a6cdc6a1bebeac9daeb51c76884a6e4d27a817ca2e9ac74c3d8a98

SHA512
7bfbf18d41ce5aeb8ce0df1df5c4b5b861ee55bade07a3277909f06da6d9950ba57ee79d6e7440edc327832e9b8a0b5c5c84889a829f9212c728999062efdade

Download Submit
memory/1760-25-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

Filesize
4KB

Download
memory/1760-26-0x0000000001300000-0x000000000134A000-memory.dmp

Filesize
296KB

Download
memory/1760-46-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/1760-79-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download

Analysis

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