44caliber | f1a5c8f4f3ab1e52cb2b85da2c0a0a1196600d77864b2a08f10994df7ca19e47

General

Target

8d88b6afcfdf51afa91d7fbdbda3123f.exe
Size

3.7MB
MD5

8d88b6afcfdf51afa91d7fbdbda3123f
SHA1

8992be4a6ad43f41f4098f5f6e16c52ce1a15128
SHA256

f1a5c8f4f3ab1e52cb2b85da2c0a0a1196600d77864b2a08f10994df7ca19e47
SHA512

1df17fbc715acee1c6a8067372c08e6566b50a92840af6d3369d00cf6f0cad9256f5d16f22f57055db89a9fb10520506f51f97eabf5177201f31fe9119df1527
SSDEEP

98304:ebvEDT/eSXK4YubNjNS/AAjz0h+9I/E9rep:eE/LYuFNp4++hSp

Score

10^/10

44caliber spyware stealer

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/867414880008142858/TD_59PPDbRxUvtxfYmpmvXB-AISV68npXT3nWVWmC5qoDjluGk0XKjmzmpP1jyAwpfZk

Signatures

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

Executes dropped EXE 2 IoCs

pid	Process
2888	cryptTROJAN.sfx.exe
1052	cryptTROJAN.exe

Loads dropped DLL 7 IoCs

pid	Process
308	8d88b6afcfdf51afa91d7fbdbda3123f.exe
308	8d88b6afcfdf51afa91d7fbdbda3123f.exe
308	8d88b6afcfdf51afa91d7fbdbda3123f.exe
2888	cryptTROJAN.sfx.exe
2888	cryptTROJAN.sfx.exe
2888	cryptTROJAN.sfx.exe
2888	cryptTROJAN.sfx.exe

Reads user/profile data of web browsers 2 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
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
2	freegeoip.app
3	freegeoip.app

Suspicious use of NtSetInformationThreadHideFromDebugger 4 IoCs

pid	Process
1052	cryptTROJAN.exe
1052	cryptTROJAN.exe
1052	cryptTROJAN.exe
1052	cryptTROJAN.exe

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1052	cryptTROJAN.exe
1052	cryptTROJAN.exe
1052	cryptTROJAN.exe
1052	cryptTROJAN.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1052	cryptTROJAN.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1052	cryptTROJAN.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 308 wrote to memory of 2888	308	8d88b6afcfdf51afa91d7fbdbda3123f.exe	27
PID 308 wrote to memory of 2888	308	8d88b6afcfdf51afa91d7fbdbda3123f.exe	27
PID 308 wrote to memory of 2888	308	8d88b6afcfdf51afa91d7fbdbda3123f.exe	27
PID 308 wrote to memory of 2888	308	8d88b6afcfdf51afa91d7fbdbda3123f.exe	27
PID 2888 wrote to memory of 1052	2888	cryptTROJAN.sfx.exe	28
PID 2888 wrote to memory of 1052	2888	cryptTROJAN.sfx.exe	28
PID 2888 wrote to memory of 1052	2888	cryptTROJAN.sfx.exe	28
PID 2888 wrote to memory of 1052	2888	cryptTROJAN.sfx.exe	28

C:\Users\Admin\AppData\Local\Temp\8d88b6afcfdf51afa91d7fbdbda3123f.exe
"C:\Users\Admin\AppData\Local\Temp\8d88b6afcfdf51afa91d7fbdbda3123f.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:308
- C:\Users\Admin\AppData\Local\Temp\cryptTROJAN.sfx.exe
  "C:\Users\Admin\AppData\Local\Temp\cryptTROJAN.sfx.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2888
- - C:\Users\Admin\AppData\Local\Temp\cryptTROJAN.exe
    "C:\Users\Admin\AppData\Local\Temp\cryptTROJAN.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Checks processor information in registry
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:1052

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

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

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Downloads

C:\ProgramData\44\Process.txt

Filesize
377B

MD5
93fd0e6e4939005c0eed8dd51984a7d4

SHA1
e6c9339826d2c2508201ac722227fb655119584b

SHA256
dc79cfc0f70516632fa2123bbe73046cbd080c1f765f43e229df383082deafc9

SHA512
544ae26f2a6dfca46b9eb5439a672c97c7c28b40647a0abdf7cd2da99de379db7655d83518a35c74059060a51336ed20a8094e78fda2ef3788281c721626372e

Download Submit
\Users\Admin\AppData\Local\Temp\cryptTROJAN.exe

Filesize
1.2MB

MD5
6bc1ac14fb765bc7aa33a62e6e7701d7

SHA1
4455de5129e69a432de89611ee791b1e2f40111f

SHA256
68f3e5266ef869124be9372c77b53a116d6ddc5e11f74fb920bd1d58bcfd4968

SHA512
6dffbecadc1e7784687960b807354abd85e7872435f033480c49ceedd08a3e40446343ffbf1f435be1779545d7b834eac5e346353c5b43e1cf0ab1df8e7e5fcc

Download Submit
\Users\Admin\AppData\Local\Temp\cryptTROJAN.sfx.exe

Filesize
1.5MB

MD5
3f5d5939fc0c515ddbc9e9894e34ae04

SHA1
8e77baff4342245a4fe90ddfc42297c778580c07

SHA256
c2667527dd33a4d633aafc8a8fe44a50b0745693c427363251ac1d28ed1a330c

SHA512
6606009775077c7756d00cf3dcb9840f33de5c823ac36e11a1de226c1ca468d026bb709e2bbcfb5b416bdf804e064067bbb455d609d418dc6ff5bd2197eeec75

Download Submit
memory/1052-34-0x0000000000030000-0x00000000003DC000-memory.dmp

Filesize
3.7MB

Download
memory/1052-35-0x0000000073D20000-0x000000007440E000-memory.dmp

Filesize
6.9MB

Download
memory/1052-36-0x0000000005960000-0x00000000059A0000-memory.dmp

Filesize
256KB

Download
memory/1052-59-0x0000000073D20000-0x000000007440E000-memory.dmp

Filesize
6.9MB

Download
memory/1052-88-0x0000000005960000-0x00000000059A0000-memory.dmp

Filesize
256KB

Download
memory/1052-90-0x0000000000030000-0x00000000003DC000-memory.dmp

Filesize
3.7MB

Download
memory/1052-91-0x0000000073D20000-0x000000007440E000-memory.dmp

Filesize
6.9MB

Download
memory/2888-32-0x0000000003A70000-0x0000000003E1C000-memory.dmp

Filesize
3.7MB

Download
memory/2888-30-0x0000000003A70000-0x0000000003E1C000-memory.dmp

Filesize
3.7MB

Download

Analysis

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