44caliber | 14430e71914c83f8d1de8e66caa39d07ab782efb662245fb9eff6aa9fca7ce87

General

Target

Loader V2.exe
Size

8.1MB
MD5

70a8a700260d1bf5d40214b4d16f2a4d
SHA1

888afda0f542f857c3627845abb17320c79348a3
SHA256

14430e71914c83f8d1de8e66caa39d07ab782efb662245fb9eff6aa9fca7ce87
SHA512

8d139e071d25106a30b3b00350fe08558bdaf884d039492611d90afd30c11ff08643560dc75ffaf7dafc0c53a96cf2b446239faf2fd8df9d0895d25b746d5d83
SSDEEP

196608:X7fP69w9dHnln76gtmUd74JVCbkQqeDDFloLRj/UVn5HIL6qG:Nvnln7RmUuJVuk0DDFWJCnVGs

Score

10^/10

44caliber xworm credential_access execution persistence rat spyware stealer trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.20:13908

147.185.221.16:60401

Attributes

Install_directory
%AppData%
install_file
svhost.exe
telegram
https://api.telegram.org/bot7220907212:AAEOc5N7cpqGUVVvnWrzGHm8mdOrYN2e9mc/sendMessage?chat_id=6987872630

Extracted

Family

44caliber

C2

https://discord.com/api/webhooks/1267250103538810911/_8BMipnmgDV4n-Uu_YmzeHrxrFFQPSAoBBDlwlDVhsDsk_31uQMADxZw-pq563wCO5KV

Signatures

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

Contains code to disable Windows Defender 1 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

Processes:

resource	yara_rule
behavioral1/memory/2800-127-0x0000000000BB0000-0x0000000000BBE000-memory.dmp	disable_win_def

Detect Xworm Payload 4 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\injectdll.exe	family_xworm
behavioral1/memory/2820-12-0x00000000008D0000-0x0000000000912000-memory.dmp	family_xworm
C:\Users\Admin\AppData\Local\Temp\loaderr.exe	family_xworm
behavioral1/memory/2800-21-0x0000000001270000-0x0000000001286000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003
Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

2116 powershell.exe
2424 powershell.exe
616 powershell.exe
1552 powershell.exe

pid	process
2116	powershell.exe
2424	powershell.exe
616	powershell.exe
1552	powershell.exe

Drops startup file 4 IoCs

Processes:

injectdll.exeloaderr.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svhost.lnk	injectdll.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svhost.lnk	injectdll.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	loaderr.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	loaderr.exe

Executes dropped EXE 4 IoCs

Processes:

Loader.exeinjectdll.exeloaderr.exefixer.exe

pid process

2052 Loader.exe
2820 injectdll.exe
2800 loaderr.exe
2708 fixer.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

pid	process
2052	Loader.exe
2820	injectdll.exe
2800	loaderr.exe
2708	fixer.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

injectdll.exeloaderr.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2172136094-3310281978-782691160-1000\Software\Microsoft\Windows\CurrentVersion\Run\svhost = "C:\\Users\\Admin\\AppData\\Roaming\\svhost.exe"	injectdll.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2172136094-3310281978-782691160-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Local\\svchost.exe"	loaderr.exe

Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

10 ip-api.com
5 freegeoip.app
6 freegeoip.app
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

flow	ioc
10	ip-api.com
5	freegeoip.app
6	freegeoip.app

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:

fixer.exe

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

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence execution

Scheduled Task
T1053.005

Processes:

schtasks.exeschtasks.exe

pid process

2460 schtasks.exe
1060 schtasks.exe

pid	process
2460	schtasks.exe
1060	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

fixer.exepowershell.exepowershell.exepowershell.exeinjectdll.exepowershell.exeloaderr.exe

pid	process
2708	fixer.exe
2708	fixer.exe
2708	fixer.exe
2708	fixer.exe
2116	powershell.exe
2424	powershell.exe
616	powershell.exe
2820	injectdll.exe
1552	powershell.exe
2800	loaderr.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

Processes:

injectdll.exeloaderr.exefixer.exepowershell.exepowershell.exepowershell.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	2820	injectdll.exe
Token: SeDebugPrivilege	2800	loaderr.exe
Token: SeDebugPrivilege	2708	fixer.exe
Token: SeDebugPrivilege	2116	powershell.exe
Token: SeDebugPrivilege	2424	powershell.exe
Token: SeDebugPrivilege	616	powershell.exe
Token: SeDebugPrivilege	2820	injectdll.exe
Token: SeDebugPrivilege	1552	powershell.exe
Token: SeDebugPrivilege	2800	loaderr.exe
Token: SeShutdownPrivilege	2800	loaderr.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

injectdll.exeloaderr.exe

pid process

2820 injectdll.exe
2800 loaderr.exe

pid	process
2820	injectdll.exe
2800	loaderr.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

Loader V2.exeLoader.exeloaderr.exeinjectdll.exe

description	pid	process	target process
PID 1496 wrote to memory of 2052	1496	Loader V2.exe	Loader.exe
PID 1496 wrote to memory of 2052	1496	Loader V2.exe	Loader.exe
PID 1496 wrote to memory of 2052	1496	Loader V2.exe	Loader.exe
PID 1496 wrote to memory of 2820	1496	Loader V2.exe	injectdll.exe
PID 1496 wrote to memory of 2820	1496	Loader V2.exe	injectdll.exe
PID 1496 wrote to memory of 2820	1496	Loader V2.exe	injectdll.exe
PID 2052 wrote to memory of 2800	2052	Loader.exe	loaderr.exe
PID 2052 wrote to memory of 2800	2052	Loader.exe	loaderr.exe
PID 2052 wrote to memory of 2800	2052	Loader.exe	loaderr.exe
PID 2052 wrote to memory of 2708	2052	Loader.exe	fixer.exe
PID 2052 wrote to memory of 2708	2052	Loader.exe	fixer.exe
PID 2052 wrote to memory of 2708	2052	Loader.exe	fixer.exe
PID 2800 wrote to memory of 2116	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 2116	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 2116	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 2424	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 2424	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 2424	2800	loaderr.exe	powershell.exe
PID 2820 wrote to memory of 2460	2820	injectdll.exe	schtasks.exe
PID 2820 wrote to memory of 2460	2820	injectdll.exe	schtasks.exe
PID 2820 wrote to memory of 2460	2820	injectdll.exe	schtasks.exe
PID 2800 wrote to memory of 616	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 616	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 616	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 1552	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 1552	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 1552	2800	loaderr.exe	powershell.exe
PID 2800 wrote to memory of 1060	2800	loaderr.exe	schtasks.exe
PID 2800 wrote to memory of 1060	2800	loaderr.exe	schtasks.exe
PID 2800 wrote to memory of 1060	2800	loaderr.exe	schtasks.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Loader V2.exe
"C:\Users\Admin\AppData\Local\Temp\Loader V2.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1496

C:\Users\Admin\AppData\Roaming\Loader.exe
"C:\Users\Admin\AppData\Roaming\Loader.exe"
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2052

C:\Users\Admin\AppData\Local\Temp\loaderr.exe
"C:\Users\Admin\AppData\Local\Temp\loaderr.exe"
3⤵
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2800

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\loaderr.exe'
4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2116

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'loaderr.exe'
4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2424

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\svchost.exe'
4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:616

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
4⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1552

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Admin\AppData\Local\svchost.exe"
4⤵
- Scheduled Task/Job: Scheduled Task
PID:1060

C:\Users\Admin\AppData\Local\Temp\fixer.exe
"C:\Users\Admin\AppData\Local\Temp\fixer.exe"
3⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2708

C:\Users\Admin\AppData\Roaming\injectdll.exe
"C:\Users\Admin\AppData\Roaming\injectdll.exe"
2⤵
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2820

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svhost" /tr "C:\Users\Admin\AppData\Roaming\svhost.exe"
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2460

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

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

System Information Discovery

2

T1082

Query Registry

2

T1012

Lateral Movement

Collection

Data from Local System

2

T1005

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\fixer.exe
Filesize
274KB

MD5
88505913c2c75f796c9a021aab2d356d

SHA1
5b5c06998d3e200c21c77ea4efaeaecdc7344e78

SHA256
62e414e990e80c8203955b0e32948ddc64903b80a462c339f1babfb03e641204

SHA512
6fa46be04c2693ea164fe52ddf3cca0bdafd1ab34d8c0f1c2bf3d361c6042f45375343f59e9474ded6718f8177a4f7eb19fddccd95f7fbb87aad12358b2d6905

Download Submit
C:\Users\Admin\AppData\Local\Temp\loaderr.exe
Filesize
65KB

MD5
95f8f28f5a8503461db6804cda9c4934

SHA1
81c0a30e498093d41948777135bbd407c7611cda

SHA256
aa40b9b929868482be1daae474d7c93426cd049f844c956865709ff8b7f240c2

SHA512
5c3460372a6640a98dd1b1d34a03b951ec4a8942e9065475e982a207881f290aedc3b51fe73c0da4c527e222addd1de2be7ba541e82287e43e16fc544ab34461

Download Submit
C:\Users\Admin\AppData\Roaming\44\Process.txt
Filesize
464B

MD5
0b60a3e3d2330b6757ef37d047a5936c

SHA1
eebe6d7204918ac32280383d1a23c0e78c3fa0df

SHA256
c1494761c969388fb7f6bec12af019a50a5df2766f3968f8f70cfc30b87fc1cc

SHA512
74f13920eaea9c4b94baa39ec41ecf5b3d5ec4cfc9838590ccb86e42a40176294bf127c0ab96c09cacfbe381467ddbd51c9ba63a009fedd759e63fcf153cd8c0

Download Submit
C:\Users\Admin\AppData\Roaming\Loader.exe
Filesize
7.6MB

MD5
aa16f3774491b600121545a5f194cefc

SHA1
c872fe765ecff1dada8378ad8a12cd5cf0425219

SHA256
c0a2b824a0fd05854818bfb81b02bc6178db3f8519807b15d844580099428e1d

SHA512
8b50e7c6eca25ecc2196fbfaf42079873e3c532a90e8d8b691fb594da3e067593f86f0d6488d0c314a27d78519f33fcbfb4532f811997891d55a47d582e1b3a8

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\Z7DQSZWIL02QVWHPX28H.temp
Filesize
7KB

MD5
c26f622ca1849de488f4896dccadbeee

SHA1
f5b43d2afe06628c03e1f1a3e05427179abafd21

SHA256
ea595e97f795fe7a71f50983701d62bf30d93c1db5a2ca060b8aba6880c04627

SHA512
11f1850acea7b3a222657021e1948d74ac762c8cb7cee07b83ea279fdeac9863355486a76bf9ceb311f7e3efeab3631ef43b68fb6545b192711ea7f5fe61b316

Download Submit
C:\Users\Admin\AppData\Roaming\injectdll.exe
Filesize
244KB

MD5
74ffb0d60d647dd6ad8d00c1bee48011

SHA1
4c8a707a33b35b78f374c66d59f9c2314c20b25f

SHA256
b481f1e0cfe25e5f19da0a0333c78661bf5c75c0b1c616ff4aaaa07aed31efd1

SHA512
fc667f4560d6b19a9a4f37eb0e66c751eb348ffc0db69c7d0bd733dfd2df2dfdadc7b780cd93686350444cc14a54283bafe3afec611bcac3ad0239eda659f46c

Download Submit
\??\PIPE\srvsvc
MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

Download Submit
memory/1496-0-0x000007FEF6543000-0x000007FEF6544000-memory.dmp

Filesize
4KB

Download
memory/1496-1-0x0000000000E40000-0x0000000001658000-memory.dmp

Filesize
8.1MB

Download
memory/2052-16-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

Filesize
9.9MB

Download
memory/2052-13-0x00000000003F0000-0x0000000000B84000-memory.dmp

Filesize
7.6MB

Download
memory/2052-43-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

Filesize
9.9MB

Download
memory/2116-100-0x0000000002860000-0x0000000002868000-memory.dmp

Filesize
32KB

Download
memory/2116-99-0x000000001B610000-0x000000001B8F2000-memory.dmp

Filesize
2.9MB

Download
memory/2424-107-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/2424-106-0x000000001B610000-0x000000001B8F2000-memory.dmp

Filesize
2.9MB

Download
memory/2708-32-0x0000000001240000-0x000000000128A000-memory.dmp

Filesize
296KB

Download
memory/2800-21-0x0000000001270000-0x0000000001286000-memory.dmp

Filesize
88KB

Download
memory/2800-127-0x0000000000BB0000-0x0000000000BBE000-memory.dmp

Filesize
56KB

Download
memory/2820-12-0x00000000008D0000-0x0000000000912000-memory.dmp

Filesize
264KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

Loading Replay Monitor...

Downloads