rustybuer | 001405ded84e227092bafe165117888d423719d7d75554025ec410d1d6558925

Analysis

max time kernel
139s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20230915-en
resource tags

arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
submitted
12-10-2023 17:42

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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

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

Suspicious use of SetThreadContext 1 IoCs

Processes:

mal.exe

description pid process target process

PID 3612 set thread context of 1064 3612 mal.exe secinit.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

secinit.exe

pid process

1064 secinit.exe
1064 secinit.exe

description	pid	process	target process
PID 3612 set thread context of 1064	3612	mal.exe	secinit.exe

pid	process
1064	secinit.exe
1064	secinit.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

mal.exe

description	pid	process	target process
PID 3612 wrote to memory of 1012	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1012	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1012	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	mal.exe	secinit.exe
PID 3612 wrote to memory of 1064	3612	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:3612
- C:\Windows\SysWOW64\secinit.exe
  "C:\Windows\System32\secinit.exe"
  2⤵
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  PID:1064
- C:\Windows\SysWOW64\secinit.exe
  "C:\Windows\System32\secinit.exe"
  2⤵
  PID:1012

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1064-2-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1064-3-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1064-1-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1064-4-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/1064-5-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/3612-0-0x0000000001440000-0x0000000001441000-memory.dmp

Filesize
4KB

Download