guloader | 793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee

Analysis

max time kernel
142s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
29-01-2023 16:44

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General

Target

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe
Size

84KB
MD5

70ed29c8a7ade32fabff34b24fa991b3
SHA1

4ef2f2e199afe62184aeb472e3727655167c6104
SHA256

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee
SHA512

e2a0293af980c4b96cf061dfd6f90aa780f315109750657f6abe1b5a96f4b41875f1d8472ad082315461719257fc6fc6bf8bf9ab0048489e8ec9da734b9af50e
SSDEEP

768:Pw5XDW3Cf0jYEfGEYeqsW/y1cawgSNnPFfHr8jNEK4cRXuPHC5qLS7OGvy2yYJkT:45q3IeGv/oSBdL8jPsHsK+1OShJM

Score

10^/10

guloader downloader guloader

Malware Config

Extracted

Family

guloader

https://drive.google.com/uc?export=download&id=1nnl01kb-i9suGiNkUXB-JA4XCUUKt-1j

xor.base64

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Guloader payload 4 IoCs

guloader

Processes:

resource	yara_rule
behavioral2/memory/3444-134-0x00000000001C0000-0x00000000001C9000-memory.dmp	family_guloader
behavioral2/memory/1016-136-0x0000000000000000-mapping.dmp	family_guloader
behavioral2/memory/1016-138-0x00000000011A0000-0x00000000012A0000-memory.dmp	family_guloader
behavioral2/memory/1016-142-0x00000000011A0000-0x00000000012A0000-memory.dmp	family_guloader

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

Processes:

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exeRegAsm.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	RegAsm.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exeRegAsm.exe

pid process

3444 793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe
1016 RegAsm.exe

pid	process
3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe
1016	RegAsm.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

description	pid	process	target process
PID 3444 set thread context of 1016	3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe	RegAsm.exe

Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

pid process

3444 793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

pid process

3444 793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

pid	process
3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

pid	process
3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe

description	pid	process	target process
PID 3444 wrote to memory of 1016	3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe	RegAsm.exe
PID 3444 wrote to memory of 1016	3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe	RegAsm.exe
PID 3444 wrote to memory of 1016	3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe	RegAsm.exe
PID 3444 wrote to memory of 1016	3444	793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe	RegAsm.exe

C:\Users\Admin\AppData\Local\Temp\793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe
"C:\Users\Admin\AppData\Local\Temp\793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe"
1⤵
- Checks QEMU agent file
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3444
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Users\Admin\AppData\Local\Temp\793f2f8dfed964a286fe7b96db07914872459c90baf13ff2c7b0bbeefa75abee.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:1016

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Web Service

T1102

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

memory/1016-143-0x00007FFACD530000-0x00007FFACD725000-memory.dmp

Filesize
2.0MB

Download
memory/1016-136-0x0000000000000000-mapping.dmp

Download
memory/1016-138-0x00000000011A0000-0x00000000012A0000-memory.dmp

Filesize
1024KB

Download
memory/1016-139-0x00007FFACD530000-0x00007FFACD725000-memory.dmp

Filesize
2.0MB

Download
memory/1016-140-0x0000000077C50000-0x0000000077DF3000-memory.dmp

Filesize
1.6MB

Download
memory/1016-142-0x00000000011A0000-0x00000000012A0000-memory.dmp

Filesize
1024KB

Download
memory/1016-144-0x0000000077C50000-0x0000000077DF3000-memory.dmp

Filesize
1.6MB

Download
memory/3444-135-0x00007FFACD530000-0x00007FFACD725000-memory.dmp

Filesize
2.0MB

Download
memory/3444-137-0x0000000077C50000-0x0000000077DF3000-memory.dmp

Filesize
1.6MB

Download
memory/3444-141-0x00000000001C0000-0x00000000001C9000-memory.dmp

Filesize
36KB

Download
memory/3444-134-0x00000000001C0000-0x00000000001C9000-memory.dmp

Filesize
36KB

Download
memory/3444-145-0x00000000001C0000-0x00000000001C9000-memory.dmp

Filesize
36KB

Download
memory/3444-146-0x0000000077C50000-0x0000000077DF3000-memory.dmp

Filesize
1.6MB

Download