44caliber | 4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b

General

Target

4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.exe
Size

646KB
MD5

2eddb25910e24b0aec14096ec42cd9c8
SHA1

8f7a1c205e3b9447d3a433ff5712e0fdd95b7b26
SHA256

4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b
SHA512

986c09949f1c1dad7a57ef95e02f47f58e954ff42d1728fae4ee054fe70d9a45504f78654304307b8c0e1c9e98a97302bd6c2f7b581ed11aa40f9d4e81bdc09a
SSDEEP

12288:pxb63VILe4Ni8zGQa13Rsatd36JBH2YQeQd6m24AWtuzJNvAMNyaS/h:pxe3VIS4N9zGQaJRsUYznXjSiCiy

Score

10^/10

44caliber spyware stealer

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/1120478623254708224/cU4HxqyVDvr-lsj-hl3z5Ir-g2JNSHG6NQxON392Hdg4s-byv9nMxsyir7Kylc5QEWVh

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
2692	Windows (2).exe
2576	Windows.exe

Loads dropped DLL 1 IoCs

pid	Process
2300	4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.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

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	Windows.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	Windows.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2576	Windows.exe
2576	Windows.exe
2576	Windows.exe
2576	Windows.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2576	Windows.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2300 wrote to memory of 2692	2300	4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.exe	30
PID 2300 wrote to memory of 2692	2300	4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.exe	30
PID 2300 wrote to memory of 2692	2300	4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.exe	30
PID 2692 wrote to memory of 2576	2692	Windows (2).exe	31
PID 2692 wrote to memory of 2576	2692	Windows (2).exe	31
PID 2692 wrote to memory of 2576	2692	Windows (2).exe	31

C:\Users\Admin\AppData\Local\Temp\4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.exe
"C:\Users\Admin\AppData\Local\Temp\4b1765e35f418e7a5698fd5709c11b98c6c4aff2637db48a7ad7b59a14b67b8b.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2300
- C:\Users\Admin\AppData\Local\Temp\Windows (2).exe
  "C:\Users\Admin\AppData\Local\Temp\Windows (2).exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:2692
- - C:\Users\Admin\AppData\Local\Temp\Windows.exe
    "C:\Users\Admin\AppData\Local\Temp\Windows.exe"
    3⤵
    - Executes dropped EXE
    - Checks processor information in registry
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2576

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

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\44\Process.txt

Filesize
418B

MD5
33846eb380a27f84479986af7f1935bc

SHA1
489ffd5dc723c612ea1c88b351532afb4f17c680

SHA256
75d9ef67ac15190f476c0277053e24f77cbf2cbef00dfa0e8c9aea86f3fce728

SHA512
c49ede38e1a667ffb0974ff88a6b46da8f9eb5393cf2aa6b082f8ce92e31ea2aa97c33758273764152e761f78902537a4078c73553627b04b82b449f2957362e

Download Submit
C:\Users\Admin\AppData\Local\Temp\Windows.exe

Filesize
274KB

MD5
4fc218b2cfdb1ad177f035002cdcaddd

SHA1
e0ccc3dcac93a0c9e14799217bc5dff557d5079b

SHA256
c1996926fd51f8418e9095057b145e173b2b182c33c12aebd36500446ef0c55d

SHA512
d114ec692399ee7b9b5cd8b7e88e6e6c0a70569d910a2ba7ef8ec3c56aa23267a60d991dca33a66ece270ae882c65735c1a144a65bebd0d7c618262f4569e5ef

Download Submit
\Users\Admin\AppData\Local\Temp\Windows (2).exe

Filesize
540KB

MD5
ff406dfb1d83072ed678d823b5bc263c

SHA1
25f025bfc7297253817997db50b0970d863095e3

SHA256
dd1612a4bcd13f52a832f4759cfc0b6905b617445dbf36cde4495db5c647d178

SHA512
e9217f9c8b3167309b7f9dcc62f97140ee6791b7850dd1b27874df1d021c7cb7afe2bee7e5d41d33731e6dde7bc004cee092e1fa007d76af910806fa678804d2

Download Submit
memory/2300-0-0x000007FEF6343000-0x000007FEF6344000-memory.dmp

Filesize
4KB

Download
memory/2300-1-0x000000013F620000-0x000000013F6C6000-memory.dmp

Filesize
664KB

Download
memory/2300-2-0x000000001AD70000-0x000000001AE44000-memory.dmp

Filesize
848KB

Download
memory/2300-3-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/2300-4-0x0000000000A80000-0x0000000000B10000-memory.dmp

Filesize
576KB

Download
memory/2300-12-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Filesize
9.9MB

Download
memory/2576-24-0x00000000000A0000-0x00000000000EA000-memory.dmp

Filesize
296KB

Download

Analysis

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