rustybuer | d3a486d3b032834b1203adefd25d0bf0b36fae7f9e72071c21ccc266e1e1f893

Analysis

max time kernel
121s
max time network
125s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
26-12-2023 17:33

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General

Target

80d5a0defa331caea1ebe788bf1dc116.exe
Size

4.1MB
MD5

80d5a0defa331caea1ebe788bf1dc116
SHA1

471408a3a30f345e70e40ec306e99bf514b30726
SHA256

d3a486d3b032834b1203adefd25d0bf0b36fae7f9e72071c21ccc266e1e1f893
SHA512

82f3cf4cde2f2d96673f1de63216a369520493889329d38b2a688f89446a0350fbc200a83c172deefdaa20f9f44bc388762484718dfb50212ba825bd5c3227dd
SSDEEP

49152:qdVNhdTN5cWr9GnzpMZ/eKL4cJtkNu/ugum94gDxNLtdHvhkIpxVVEZGZapnhlkD:qdVNxkKeW424u/ug9DVSdlYg7mrPiVo

Score

10^/10

rustybuer loader

Malware Config

Extracted

Family

rustybuer

https://karbotza.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

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2232 set thread context of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2804	secinit.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28
PID 2232 wrote to memory of 2804	2232	80d5a0defa331caea1ebe788bf1dc116.exe	28

C:\Users\Admin\AppData\Local\Temp\80d5a0defa331caea1ebe788bf1dc116.exe
"C:\Users\Admin\AppData\Local\Temp\80d5a0defa331caea1ebe788bf1dc116.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2232
- C:\Windows\SysWOW64\secinit.exe
  "C:\Windows\System32\secinit.exe"
  2⤵
  - Enumerates connected drives
  - Suspicious behavior: EnumeratesProcesses
  PID:2804

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/2232-0-0x0000000000020000-0x0000000000021000-memory.dmp

Filesize
4KB

Download
memory/2804-1-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-3-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-5-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-9-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-8-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2804-11-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-12-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-7-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-6-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download
memory/2804-13-0x0000000000400000-0x0000000000571000-memory.dmp

Filesize
1.4MB

Download