44caliber | af0c48ca1ed3431b936d489bf1e8255a5d4182bd6164946bd6179ae3f212d0b1

General

Target

RP.sfx.exe
Size

10.0MB
MD5

e335f71c0f053c393626691bd60a58a4
SHA1

0cc99df70cca24c5f96edf36672ea297fe71043f
SHA256

af0c48ca1ed3431b936d489bf1e8255a5d4182bd6164946bd6179ae3f212d0b1
SHA512

eaa5b09100e133cd7241258255c02be262d3f6061774f9d32424922aaae8fa04d148f665d7c61c6f7ac1f1a23e87994b7bc6b0ba7fdd2fd0fa2d4575ac460195
SSDEEP

196608:uchhf7FHaM6MkwG2ea8oQoidqpcO49UEahKBXSmLnS0rCqs2vm9EGgy:dvfBdPG2QzoY1OgUEPV7r9s2+9bgy

Score

10^/10

44caliber discovery spyware stealer

Malware Config

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/1162710207558852689/c241__Tv-C5fSE0jsivUVIhYUTy9AQG_2q-Wedc4i61WcTidBFF8dAoQzbri3Cz5u5KI

Signatures

44Caliber
An open source infostealer written in C#.
stealer 44caliber
44Caliber family
44caliber
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

RP.sfx.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation RP.sfx.exe
Executes dropped EXE 1 IoCs

Processes:

RP.EXE

pid process

2788 RP.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.

Processes:

flow ioc

5 freegeoip.app
8 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

Processes:

RP.sfx.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language RP.sfx.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	RP.sfx.exe

pid	process
2788	RP.EXE

flow	ioc
5	freegeoip.app
8	freegeoip.app

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RP.sfx.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

Processes:

RP.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\Description\System\CentralProcessor\0	RP.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	RP.EXE

Modifies registry class 2 IoCs

Processes:

RP.sfx.exeOpenWith.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	RP.sfx.exe
Key created	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	OpenWith.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

RP.EXE

pid process

2788 RP.EXE
2788 RP.EXE
2788 RP.EXE
2788 RP.EXE
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

RP.EXE

description pid process

Token: SeDebugPrivilege 2788 RP.EXE
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

OpenWith.exe

pid process

4896 OpenWith.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

RP.sfx.exe

description pid process target process

PID 3728 wrote to memory of 2788 3728 RP.sfx.exe RP.EXE
PID 3728 wrote to memory of 2788 3728 RP.sfx.exe RP.EXE

pid	process
2788	RP.EXE
2788	RP.EXE
2788	RP.EXE
2788	RP.EXE

description	pid	process
Token: SeDebugPrivilege	2788	RP.EXE

pid	process
4896	OpenWith.exe

description	pid	process	target process
PID 3728 wrote to memory of 2788	3728	RP.sfx.exe	RP.EXE
PID 3728 wrote to memory of 2788	3728	RP.sfx.exe	RP.EXE

C:\Users\Admin\AppData\Local\Temp\RP.sfx.exe
"C:\Users\Admin\AppData\Local\Temp\RP.sfx.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3728
- C:\Users\Admin\AppData\Local\Temp\RESOURCEPACK\RP.EXE
  "C:\Users\Admin\AppData\Local\Temp\RESOURCEPACK\RP.EXE"
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2788

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4896

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

2

T1012

System Information Discovery

3

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

Loading Replay Monitor...

Downloads

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

Filesize
755B

MD5
d219ff1246c65dbd2515be2bd1ef4836

SHA1
40e330e80a84f50a00b19c782cc3d68c6eda79bb

SHA256
cdb34980b9afc567cd34114d592d51f08b5e67933ff2fc7e30051884e27c04aa

SHA512
5c44972aba6854f4bed11268e8502cd7c414226e9e7fe70266bb9b84043cf8e967c6100ad4d5ac41905fc643dd50bec17e3074f413de8396544cfa04aceaff93

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

Filesize
1KB

MD5
f4f57a6932e509ee00a438f87a597ac1

SHA1
52b13c00e5cbc76b555969e7b4c117ed62fbae52

SHA256
03ccfdf13b435e069b5f483241fc0f7749e4ad966c0f3486f493d3d1f7fe0266

SHA512
233165181b259c2011ea8ed9dc8fc5b14794604e776a6bd2f0be071a9e90c6b802824d1a06b3c8bb448cdd121670f320eb9acc4337204431af2f3debc653b81a

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

Filesize
251KB

MD5
513286e3e241f1c93556f45db4f8dc23

SHA1
32c83261b6ac5663e91664764aab429e6cd424d1

SHA256
a46070cb169ed0754c0fb624ad29f59fbc66fb75df9d2b3daefda76bc0d0d893

SHA512
890a2d7a72cf9975ebd716ad3c6f05f595afd1218106054c3c33ff1b9d41baf52c0013b8f65d975d372151b3303311f6554cb412fbcbbb0cf01dc8e81109f693

Download Submit
memory/2788-14-0x00007FFE2DE13000-0x00007FFE2DE15000-memory.dmp

Filesize
8KB

Download
memory/2788-16-0x0000026E53F20000-0x0000026E53F66000-memory.dmp

Filesize
280KB

Download
memory/2788-43-0x00007FFE2DE10000-0x00007FFE2E8D1000-memory.dmp

Filesize
10.8MB

Download
memory/2788-137-0x00007FFE2DE10000-0x00007FFE2E8D1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing