rustybuer | 532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911

Analysis

max time kernel
147s
max time network
34s
platform
windows7_x64
resource
win7-20230621-en
resource tags

arch:x64arch:x86image:win7-20230621-enlocale:en-usos:windows7-x64system
submitted
26-06-2023 03:26

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General

Target

532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
Size

1.4MB
MD5

59afa5bc60bf7b9adb7dd4a0df84c0d9
SHA1

e3aa21d37156ea87d87ccbd011cf84896621b572
SHA256

532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911
SHA512

4453e05b34f44f2ed9af0a51dfae9e08669812e47cc32699285c617981b1f106d617db308aff60b4da109eb1c35639a89e3e3b4d5d66d568106a5f529639bc98
SSDEEP

24576:T4pCbcwQbbC+/bb2GRrILR4IKz/L5uqju6u/kKxmgMfBvOoUSd3GdrwSRHIp:UpAnhalMRLKLhjtu/3xm3GzSdWdVHG

Score

10^/10

rustybuer loader

Malware Config

Extracted

Family

rustybuer

https://serevalutinoffice.com/

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe

Enumerates connected drives 3 TTPs 49 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)	\??\a:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\H:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\K:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\O:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\G:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\l:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\p:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\T:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\z:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\w:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\g:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\J:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\L:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\m:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\N:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\Q:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\Z:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\b:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\B:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\D:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\f:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\j:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\u:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\U:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\v:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\E:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\I:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\R:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\s:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\t:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\V:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\x:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\X:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\F:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\h:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\k:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\P:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\q:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\A:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\i:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\r:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\S:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\y:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\Y:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\e:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\M:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\n:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\o:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
File opened (read-only)	\??\W:	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1176 set thread context of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28
PID 1176 wrote to memory of 1212	1176	532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe	28

C:\Users\Admin\AppData\Local\Temp\532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
"C:\Users\Admin\AppData\Local\Temp\532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1176
- C:\Users\Admin\AppData\Local\Temp\532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe
  "C:\Users\Admin\AppData\Local\Temp\532e97e0ff4498854440784c6e7bcb8ed84ca654fb4acf893e8255b8a8c37911.exe"
  2⤵
  - Enumerates connected drives
  PID:1212

Network

MITRE ATT&CK Enterprise v6

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

\Users\Admin\AppData\Local\Temp\nsdBF4.tmp\System.dll

Filesize
11KB

MD5
0063d48afe5a0cdc02833145667b6641

SHA1
e7eb614805d183ecb1127c62decb1a6be1b4f7a8

SHA256
ac9dfe3b35ea4b8932536ed7406c29a432976b685cc5322f94ef93df920fede7

SHA512
71cbbcaeb345e09306e368717ea0503fe8df485be2e95200febc61bcd8ba74fb4211cd263c232f148c0123f6c6f2e3fd4ea20bdecc4070f5208c35c6920240f0

Download Submit
memory/1212-63-0x0000000000400000-0x0000000000534000-memory.dmp

Filesize
1.2MB

Download
memory/1212-65-0x0000000000400000-0x0000000000534000-memory.dmp

Filesize
1.2MB

Download
memory/1212-66-0x0000000000400000-0x0000000000534000-memory.dmp

Filesize
1.2MB

Download
memory/1212-67-0x0000000000400000-0x0000000000534000-memory.dmp

Filesize
1.2MB

Download