guloader | 27bd31839d54056c7868df571290b527d4940f209b66b3bb0a2cfb31f454c7d2

Analysis

max time kernel
150s
max time network
124s
platform
windows7_x64
resource
win7-20230712-en
resource tags

arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
submitted
17-07-2023 05:54

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General

Target

32307017.xls
Size

1.4MB
MD5

ab03f70b31107892e798091706ca4f4f
SHA1

6975a37ca9a7e5ed68111457e0633992bac30a53
SHA256

27bd31839d54056c7868df571290b527d4940f209b66b3bb0a2cfb31f454c7d2
SHA512

e2b9d7e74fc7c58ea6e59f67f8e4589c7201705bf04a5ea53a0fc60afba7b8e205b1cd4048205f5e65e7f822558b1c56c5cef6cd43ea77c80c850e1f8d644656
SSDEEP

24576:wgu9VNZylw6V9OZyOw6VleHBlEzp7uNR0bgcwyA52CcP5YwVux:wguPR6V9YO6V8hOzNgjyPP5Yz

Score

10^/10

guloader smokeloader backdoor downloader trojan

Malware Config

Extracted

Family

smokeloader

Version

2022

http://cletonmy.com/

http://alpatrik.com/

rc4.i32

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader

Blocklisted process makes network request 1 IoCs

flow	pid	Process
4	2588	EQNEDT32.EXE

Downloads MZ/PE file

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	IBM_Centosie.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	IBM_Centosie.exe

Executes dropped EXE 1 IoCs

pid	Process
2896	IBM_Centosie.exe

Loads dropped DLL 4 IoCs

pid	Process
2588	EQNEDT32.EXE
2896	IBM_Centosie.exe
2896	IBM_Centosie.exe
2712	IBM_Centosie.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2712	IBM_Centosie.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2896	IBM_Centosie.exe
2712	IBM_Centosie.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2896 set thread context of 2712	2896	IBM_Centosie.exe	34

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

System Information Discovery
T1082

NSIS installer 12 IoCs

installer

resource	yara_rule
behavioral1/files/0x0006000000018b1c-67.dat	nsis_installer_1
behavioral1/files/0x0006000000018b1c-67.dat	nsis_installer_2
behavioral1/files/0x0006000000018b1c-68.dat	nsis_installer_1
behavioral1/files/0x0006000000018b1c-68.dat	nsis_installer_2
behavioral1/files/0x0006000000018b1c-71.dat	nsis_installer_1
behavioral1/files/0x0006000000018b1c-71.dat	nsis_installer_2
behavioral1/files/0x0006000000018b1c-72.dat	nsis_installer_1
behavioral1/files/0x0006000000018b1c-72.dat	nsis_installer_2
behavioral1/files/0x0006000000018b1c-86.dat	nsis_installer_1
behavioral1/files/0x0006000000018b1c-86.dat	nsis_installer_2
behavioral1/files/0x0006000000018b1c-88.dat	nsis_installer_1
behavioral1/files/0x0006000000018b1c-88.dat	nsis_installer_2

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	IBM_Centosie.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	IBM_Centosie.exe
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	IBM_Centosie.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

Launches Equation Editor 1 TTPs 1 IoCs

Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

exploit

Exploitation for Client Execution

T1203

pid	Process
2588	EQNEDT32.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1112	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2712	IBM_Centosie.exe
2712	IBM_Centosie.exe
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found
1272	Process not Found

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1272	Process not Found

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2896	IBM_Centosie.exe
2712	IBM_Centosie.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeShutdownPrivilege	1272	Process not Found

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE
1112	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2588 wrote to memory of 2896	2588	EQNEDT32.EXE	32
PID 2588 wrote to memory of 2896	2588	EQNEDT32.EXE	32
PID 2588 wrote to memory of 2896	2588	EQNEDT32.EXE	32
PID 2588 wrote to memory of 2896	2588	EQNEDT32.EXE	32
PID 2896 wrote to memory of 2712	2896	IBM_Centosie.exe	34
PID 2896 wrote to memory of 2712	2896	IBM_Centosie.exe	34
PID 2896 wrote to memory of 2712	2896	IBM_Centosie.exe	34
PID 2896 wrote to memory of 2712	2896	IBM_Centosie.exe	34
PID 2896 wrote to memory of 2712	2896	IBM_Centosie.exe	34

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\32307017.xls
1⤵
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1112

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:2588
- C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe
  "C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe"
  2⤵
  - Checks QEMU agent file
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:2896
- - C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe
    "C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe"
    3⤵
    - Checks QEMU agent file
    - Loads dropped DLL
    - Suspicious use of NtCreateThreadExHideFromDebugger
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Checks SCSI registry key(s)
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    PID:2712

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Exploitation for Client Execution

T1203

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

C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.MSO\F55E990B.emf

Filesize
1.4MB

MD5
a01b9617553432807b9b58025b338d97

SHA1
439bdcc450408b9735b2428c2d53d2e6977fa58c

SHA256
7a0426ed2e2349916969ff7087c0f76089fb8ce7f4627f3d11ccbc1aaefcedce

SHA512
312cc2563fa865d6a939fea85a520627c73ed9a95bafc98c89495f21d535dc658825be74b64f0f5c5815d1d234fc6e77a71779247e4973e39ba8dccec2f09bee

Download Submit
C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe

Filesize
399KB

MD5
bf116d38feeab4b00d4b8703776ffdf3

SHA1
175a33faf58fa9d8af84da39527357363ee42de4

SHA256
b7779eb7756debf18a7d37bb2a04cbac8420167ea8f746774835e73fa4458703

SHA512
24590155f0aa2b7276d3779940dc1d2656b7f180187b15c55e864a90ef667bff8d12af74bd5823207857f09066fcd093c5994f31359d8625c5feb47c7204a955

Download Submit
C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe

Filesize
399KB

MD5
bf116d38feeab4b00d4b8703776ffdf3

SHA1
175a33faf58fa9d8af84da39527357363ee42de4

SHA256
b7779eb7756debf18a7d37bb2a04cbac8420167ea8f746774835e73fa4458703

SHA512
24590155f0aa2b7276d3779940dc1d2656b7f180187b15c55e864a90ef667bff8d12af74bd5823207857f09066fcd093c5994f31359d8625c5feb47c7204a955

Download Submit
C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe

Filesize
399KB

MD5
bf116d38feeab4b00d4b8703776ffdf3

SHA1
175a33faf58fa9d8af84da39527357363ee42de4

SHA256
b7779eb7756debf18a7d37bb2a04cbac8420167ea8f746774835e73fa4458703

SHA512
24590155f0aa2b7276d3779940dc1d2656b7f180187b15c55e864a90ef667bff8d12af74bd5823207857f09066fcd093c5994f31359d8625c5feb47c7204a955

Download Submit
C:\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe

Filesize
399KB

MD5
bf116d38feeab4b00d4b8703776ffdf3

SHA1
175a33faf58fa9d8af84da39527357363ee42de4

SHA256
b7779eb7756debf18a7d37bb2a04cbac8420167ea8f746774835e73fa4458703

SHA512
24590155f0aa2b7276d3779940dc1d2656b7f180187b15c55e864a90ef667bff8d12af74bd5823207857f09066fcd093c5994f31359d8625c5feb47c7204a955

Download Submit
\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe

Filesize
399KB

MD5
bf116d38feeab4b00d4b8703776ffdf3

SHA1
175a33faf58fa9d8af84da39527357363ee42de4

SHA256
b7779eb7756debf18a7d37bb2a04cbac8420167ea8f746774835e73fa4458703

SHA512
24590155f0aa2b7276d3779940dc1d2656b7f180187b15c55e864a90ef667bff8d12af74bd5823207857f09066fcd093c5994f31359d8625c5feb47c7204a955

Download Submit
\Users\Admin\AppData\Local\Temp\IBM_Centosie.exe

Filesize
399KB

MD5
bf116d38feeab4b00d4b8703776ffdf3

SHA1
175a33faf58fa9d8af84da39527357363ee42de4

SHA256
b7779eb7756debf18a7d37bb2a04cbac8420167ea8f746774835e73fa4458703

SHA512
24590155f0aa2b7276d3779940dc1d2656b7f180187b15c55e864a90ef667bff8d12af74bd5823207857f09066fcd093c5994f31359d8625c5feb47c7204a955

Download Submit
\Users\Admin\AppData\Local\Temp\nsyFC1C.tmp\System.dll

Filesize
11KB

MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
memory/1112-82-0x000000007405D000-0x0000000074068000-memory.dmp

Filesize
44KB

Download
memory/1112-114-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1112-129-0x000000007405D000-0x0000000074068000-memory.dmp

Filesize
44KB

Download
memory/1112-55-0x000000007405D000-0x0000000074068000-memory.dmp

Filesize
44KB

Download
memory/1112-54-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1272-98-0x0000000002B70000-0x0000000002B86000-memory.dmp

Filesize
88KB

Download
memory/2712-96-0x0000000001470000-0x0000000003CE2000-memory.dmp

Filesize
40.4MB

Download
memory/2712-99-0x0000000001470000-0x0000000003CE2000-memory.dmp

Filesize
40.4MB

Download
memory/2712-90-0x0000000001470000-0x0000000003CE2000-memory.dmp

Filesize
40.4MB

Download
memory/2712-91-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2712-92-0x0000000077C60000-0x0000000077E09000-memory.dmp

Filesize
1.7MB

Download
memory/2712-93-0x0000000001470000-0x0000000003CE2000-memory.dmp

Filesize
40.4MB

Download
memory/2712-95-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2712-102-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2712-97-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2712-89-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2896-85-0x0000000077E50000-0x0000000077F26000-memory.dmp

Filesize
856KB

Download
memory/2896-87-0x0000000074260000-0x0000000074266000-memory.dmp

Filesize
24KB

Download
memory/2896-84-0x0000000077C60000-0x0000000077E09000-memory.dmp

Filesize
1.7MB

Download
memory/2896-83-0x00000000038D0000-0x0000000006142000-memory.dmp

Filesize
40.4MB

Download
memory/2896-81-0x00000000038D0000-0x0000000006142000-memory.dmp

Filesize
40.4MB

Download