rustybuer | 001405ded84e227092bafe165117888d423719d7d75554025ec410d1d6558925

General

Target

mal.exe
Size

3.2MB
MD5

cd2eb880ecbad847cb6205a42708e5e4
SHA1

aadaba5e4d887136cbcb3df0a4dc0eb94f391585
SHA256

001405ded84e227092bafe165117888d423719d7d75554025ec410d1d6558925
SHA512

b0591d6e4181275001fdefb70e04bdeb1b241dc696a887f36375826904bc164714bfe5d0b86e39952f877309571b9a0212ca5e5f122c6393cb17a797b0c2f8b2
SSDEEP

49152:Ww/9l48pPUbkSv5TCcLhAKFEl3In1bnkpisogrpu4r+3qwsi:WcfUbZGcLMIn1Lkp3lrpuh8i

Score

10^/10

rustybuer loader

Malware Config

Extracted

Family

rustybuer

C2

https://vesupyny.com/

Signatures

RustyBuer
RustyBuer is a new variant of Buer loader written in Rust.
loader rustybuer

Enumerates connected drives 3 TTPs 48 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

secinit.exe

description	ioc	process
File opened (read-only)	\??\n:	secinit.exe
File opened (read-only)	\??\q:	secinit.exe
File opened (read-only)	\??\r:	secinit.exe
File opened (read-only)	\??\Z:	secinit.exe
File opened (read-only)	\??\D:	secinit.exe
File opened (read-only)	\??\G:	secinit.exe
File opened (read-only)	\??\k:	secinit.exe
File opened (read-only)	\??\i:	secinit.exe
File opened (read-only)	\??\j:	secinit.exe
File opened (read-only)	\??\K:	secinit.exe
File opened (read-only)	\??\M:	secinit.exe
File opened (read-only)	\??\u:	secinit.exe
File opened (read-only)	\??\A:	secinit.exe
File opened (read-only)	\??\B:	secinit.exe
File opened (read-only)	\??\F:	secinit.exe
File opened (read-only)	\??\w:	secinit.exe
File opened (read-only)	\??\W:	secinit.exe
File opened (read-only)	\??\t:	secinit.exe
File opened (read-only)	\??\x:	secinit.exe
File opened (read-only)	\??\a:	secinit.exe
File opened (read-only)	\??\b:	secinit.exe
File opened (read-only)	\??\E:	secinit.exe
File opened (read-only)	\??\U:	secinit.exe
File opened (read-only)	\??\V:	secinit.exe
File opened (read-only)	\??\y:	secinit.exe
File opened (read-only)	\??\L:	secinit.exe
File opened (read-only)	\??\p:	secinit.exe
File opened (read-only)	\??\T:	secinit.exe
File opened (read-only)	\??\O:	secinit.exe
File opened (read-only)	\??\H:	secinit.exe
File opened (read-only)	\??\m:	secinit.exe
File opened (read-only)	\??\N:	secinit.exe
File opened (read-only)	\??\z:	secinit.exe
File opened (read-only)	\??\Q:	secinit.exe
File opened (read-only)	\??\S:	secinit.exe
File opened (read-only)	\??\X:	secinit.exe
File opened (read-only)	\??\v:	secinit.exe
File opened (read-only)	\??\Y:	secinit.exe
File opened (read-only)	\??\g:	secinit.exe
File opened (read-only)	\??\h:	secinit.exe
File opened (read-only)	\??\s:	secinit.exe
File opened (read-only)	\??\l:	secinit.exe
File opened (read-only)	\??\o:	secinit.exe
File opened (read-only)	\??\P:	secinit.exe
File opened (read-only)	\??\R:	secinit.exe
File opened (read-only)	\??\e:	secinit.exe
File opened (read-only)	\??\I:	secinit.exe
File opened (read-only)	\??\J:	secinit.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

mal.exe

description pid process target process

PID 1252 set thread context of 1916 1252 mal.exe secinit.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

secinit.exe

pid process

1916 secinit.exe

description	pid	process	target process
PID 1252 set thread context of 1916	1252	mal.exe	secinit.exe

pid	process
1916	secinit.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

mal.exe

description	pid	process	target process
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe
PID 1252 wrote to memory of 1916	1252	mal.exe	secinit.exe

C:\Users\Admin\AppData\Local\Temp\mal.exe
"C:\Users\Admin\AppData\Local\Temp\mal.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1252
- C:\Windows\SysWOW64\secinit.exe
  "C:\Windows\System32\secinit.exe"
  2⤵
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  PID:1916

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1252-0-0x0000000000020000-0x0000000000021000-memory.dmp

Filesize
4KB

Download
memory/1916-1-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-3-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-5-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-6-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-7-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-8-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1916-9-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-11-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-12-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1916-13-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download

Analysis

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