Malware Analysis Report

2025-05-28 18:51

Sample ID 250111-f1dnaawkgy
Target d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe
SHA256 d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2
Tags
guloader collection discovery downloader evasion spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral4

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2

Threat Level: Known bad

The file d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe was found to be: Known bad.

Malicious Activity Summary

guloader collection discovery downloader evasion spyware stealer

Guloader family

Guloader,Cloudeye

Disables Task Manager via registry modification

Loads dropped DLL

Reads user/profile data of web browsers

Reads user/profile data of local email clients

Legitimate hosting services abused for malware hosting/C2

Looks up external IP address via web service

Accesses Microsoft Outlook profiles

Suspicious use of SetThreadContext

Suspicious use of NtSetInformationThreadHideFromDebugger

Suspicious use of NtCreateThreadExHideFromDebugger

Drops file in System32 directory

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Unsigned PE

Program crash

Suspicious behavior: EnumeratesProcesses

outlook_win_path

outlook_office_path

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-01-11 05:20

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Analysis: behavioral2

Detonation Overview

Submitted

2025-01-11 05:20

Reported

2025-01-11 05:22

Platform

win10v2004-20241007-en

Max time kernel

147s

Max time network

145s

Command Line

"C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Disables Task Manager via registry modification

evasion

Reads user/profile data of local email clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Accesses Microsoft Outlook profiles

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A drive.google.com N/A N/A
N/A drive.google.com N/A N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A checkip.dyndns.org N/A N/A
N/A reallyfreegeoip.org N/A N/A
N/A reallyfreegeoip.org N/A N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\hjemmecomputeren.Pot C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

outlook_office_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

outlook_win_path

Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676 C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe

"C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe"

C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe

"C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 drive.google.com udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 c.pki.goog udp
GB 142.250.178.3:80 c.pki.goog tcp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.200.35:80 o.pki.goog tcp
US 8.8.8.8:53 drive.usercontent.google.com udp
US 8.8.8.8:53 238.179.250.142.in-addr.arpa udp
US 8.8.8.8:53 3.178.250.142.in-addr.arpa udp
US 8.8.8.8:53 35.200.250.142.in-addr.arpa udp
GB 216.58.212.193:443 drive.usercontent.google.com tcp
US 8.8.8.8:53 193.212.58.216.in-addr.arpa udp
US 8.8.8.8:53 checkip.dyndns.org udp
JP 132.226.8.169:80 checkip.dyndns.org tcp
US 8.8.8.8:53 169.8.226.132.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 reallyfreegeoip.org udp
US 104.21.64.1:443 reallyfreegeoip.org tcp
US 8.8.8.8:53 1.64.21.104.in-addr.arpa udp
US 8.8.8.8:53 api.telegram.org udp
NL 149.154.167.220:443 api.telegram.org tcp
US 8.8.8.8:53 220.167.154.149.in-addr.arpa udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 180.129.81.91.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\nsmA3C3.tmp\System.dll

MD5 ee260c45e97b62a5e42f17460d406068
SHA1 df35f6300a03c4d3d3bd69752574426296b78695
SHA256 e94a1f7bcd7e0d532b660d0af468eb3321536c3efdca265e61f9ec174b1aef27
SHA512 a98f350d17c9057f33e5847462a87d59cbf2aaeda7f6299b0d49bb455e484ce4660c12d2eb8c4a0d21df523e729222bbd6c820bf25b081bc7478152515b414b3

memory/5008-14-0x0000000002A60000-0x0000000005430000-memory.dmp

memory/5008-15-0x0000000077771000-0x0000000077891000-memory.dmp

memory/5008-16-0x0000000010004000-0x0000000010005000-memory.dmp

memory/5008-17-0x0000000002A60000-0x0000000005430000-memory.dmp

memory/444-18-0x00000000016C0000-0x0000000004090000-memory.dmp

memory/444-31-0x0000000000460000-0x00000000016B4000-memory.dmp

memory/444-32-0x0000000000460000-0x000000000047E000-memory.dmp

memory/444-33-0x0000000036CE0000-0x0000000037284000-memory.dmp

memory/444-34-0x0000000036C00000-0x0000000036C9C000-memory.dmp

memory/444-36-0x00000000016C0000-0x0000000004090000-memory.dmp

memory/444-37-0x0000000037690000-0x0000000037722000-memory.dmp

memory/444-38-0x00000000372D0000-0x0000000037320000-memory.dmp

memory/444-39-0x0000000037830000-0x00000000379F2000-memory.dmp

memory/444-41-0x0000000037AB0000-0x0000000037ABA000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2025-01-11 05:20

Reported

2025-01-11 05:22

Platform

win7-20241010-en

Max time kernel

122s

Max time network

128s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1300 -s 228

Network

N/A

Files

N/A

Analysis: behavioral4

Detonation Overview

Submitted

2025-01-11 05:20

Reported

2025-01-11 05:22

Platform

win10v2004-20241007-en

Max time kernel

149s

Max time network

151s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

Signatures

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3852 wrote to memory of 2448 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3852 wrote to memory of 2448 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3852 wrote to memory of 2448 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\System.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2448 -ip 2448

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2448 -s 612

Network

Country Destination Domain Proto
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 20.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 17.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 253.15.104.51.in-addr.arpa udp

Files

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2025-01-11 05:20

Reported

2025-01-11 05:22

Platform

win7-20241010-en

Max time kernel

118s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe"

Signatures

Guloader family

guloader

Guloader,Cloudeye

downloader guloader

Disables Task Manager via registry modification

evasion

Reads user/profile data of web browsers

spyware stealer

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A drive.google.com N/A N/A
N/A drive.google.com N/A N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A checkip.dyndns.org N/A N/A
N/A reallyfreegeoip.org N/A N/A
N/A reallyfreegeoip.org N/A N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\hjemmecomputeren.Pot C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious use of NtCreateThreadExHideFromDebugger

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2824 wrote to memory of 2100 N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe
PID 2824 wrote to memory of 2100 N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe
PID 2824 wrote to memory of 2100 N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe
PID 2824 wrote to memory of 2100 N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe
PID 2824 wrote to memory of 2100 N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe
PID 2824 wrote to memory of 2100 N/A C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe

Processes

C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe

"C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe"

C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe

"C:\Users\Admin\AppData\Local\Temp\d279cafd050cd071af764df4cc856e9e188ce0c920d13429a3b33129c7e4cee2.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 drive.google.com udp
GB 142.250.179.238:443 drive.google.com tcp
US 8.8.8.8:53 c.pki.goog udp
GB 142.250.200.35:80 c.pki.goog tcp
US 8.8.8.8:53 o.pki.goog udp
GB 142.250.200.35:80 o.pki.goog tcp
US 8.8.8.8:53 drive.usercontent.google.com udp
GB 216.58.212.193:443 drive.usercontent.google.com tcp
US 8.8.8.8:53 checkip.dyndns.org udp
US 158.101.44.242:80 checkip.dyndns.org tcp
US 8.8.8.8:53 reallyfreegeoip.org udp
US 104.21.112.1:443 reallyfreegeoip.org tcp
US 8.8.8.8:53 www.microsoft.com udp
GB 92.123.241.137:80 www.microsoft.com tcp
US 8.8.8.8:53 crl.microsoft.com udp
GB 88.221.134.146:80 crl.microsoft.com tcp

Files

\Users\Admin\AppData\Local\Temp\nse5AAF.tmp\System.dll

MD5 ee260c45e97b62a5e42f17460d406068
SHA1 df35f6300a03c4d3d3bd69752574426296b78695
SHA256 e94a1f7bcd7e0d532b660d0af468eb3321536c3efdca265e61f9ec174b1aef27
SHA512 a98f350d17c9057f33e5847462a87d59cbf2aaeda7f6299b0d49bb455e484ce4660c12d2eb8c4a0d21df523e729222bbd6c820bf25b081bc7478152515b414b3

memory/2824-16-0x00000000027A0000-0x0000000005170000-memory.dmp

memory/2824-17-0x00000000027A0000-0x0000000005170000-memory.dmp

memory/2824-18-0x0000000077B41000-0x0000000077C42000-memory.dmp

memory/2824-19-0x0000000077B40000-0x0000000077CE9000-memory.dmp

memory/2100-20-0x0000000077B40000-0x0000000077CE9000-memory.dmp

memory/2824-21-0x00000000027A0000-0x0000000005170000-memory.dmp

memory/2100-43-0x0000000000460000-0x00000000014C2000-memory.dmp

memory/2100-44-0x0000000000460000-0x000000000047E000-memory.dmp