vidar | 341fecc8089d07c5ddfdfb4925b3243681723294dc9fb211c5d5f14441ccee85

Analysis

max time kernel
71s
max time network
104s
platform
windows7_x64
resource
win7v20201028
submitted
22/12/2020, 11:51

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General

Target
FRAUD NOTIFICATION 35738-59.doc
Size 2.6MB
Sample201222-d1pdf2pc1s
SHA256 341fecc8089d07c5ddfdfb4925b3243681723294dc9fb211c5d5f14441ccee85
MD5 ca57c1bae3adf7258073760016dfd9ff
SHA1 875074001481bbe00ad8640cc30a23abb99cb38d
SHA512 68e97768dc325e2ed22977dd8ce40005070fcab1caaf151462a838aa6ce061d506891cd88648db28396cfd1aee4eb79745b3cf9587259a51a8c8ce0c29dd0f7b
MD5 SHA1 SHA512

Score

10^/10

vidar discovery spyware stealer upx

Malware Config

Signatures

Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar

Blocklisted process makes network request 5 IoCs

flow	pid	Process
7	1660	EQNEDT32.EXE
9	1660	EQNEDT32.EXE
11	1660	EQNEDT32.EXE
13	1660	EQNEDT32.EXE
15	1660	EQNEDT32.EXE

Executes dropped EXE 1 IoCs

pid	Process
852	7654333.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
	upx
behavioral1/files/0x00030000000130ff-4.dat	upx
behavioral1/files/0x00030000000130ff-5.dat	upx
behavioral1/files/0x00030000000130ff-7.dat	upx
behavioral1/files/0x00030000000130ff-16.dat	upx

Loads dropped DLL 6 IoCs

pid	Process
1660	EQNEDT32.EXE
1660	EQNEDT32.EXE
852	7654333.exe
852	7654333.exe
852	7654333.exe
852	7654333.exe

Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware

Data from Local System
T1005

Credentials in Files
T1081
Accesses 2FA software files, possible credential harvesting 2 TTPs
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

JavaScript code in executable 1 IoCs

resource	yara_rule
behavioral1/files/0x000300000001310f-10.dat	js

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
19	ip-api.com

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

Office loads VBA resources, possible macro or embedded object present

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	7654333.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	7654333.exe

Kills process with taskkill 1 IoCs

evasion

pid	Process
960	taskkill.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
1660	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
1684	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
852	7654333.exe
852	7654333.exe
852	7654333.exe
852	7654333.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	960	taskkill.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1684	WINWORD.EXE
1684	WINWORD.EXE

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 1960	1684	WINWORD.EXE	26
PID 1684 wrote to memory of 1960	1684	WINWORD.EXE	26
PID 1684 wrote to memory of 1960	1684	WINWORD.EXE	26
PID 1684 wrote to memory of 1960	1684	WINWORD.EXE	26
PID 1660 wrote to memory of 852	1660	EQNEDT32.EXE	33
PID 1660 wrote to memory of 852	1660	EQNEDT32.EXE	33
PID 1660 wrote to memory of 852	1660	EQNEDT32.EXE	33
PID 1660 wrote to memory of 852	1660	EQNEDT32.EXE	33
PID 852 wrote to memory of 1032	852	7654333.exe	37
PID 852 wrote to memory of 1032	852	7654333.exe	37
PID 852 wrote to memory of 1032	852	7654333.exe	37
PID 852 wrote to memory of 1032	852	7654333.exe	37
PID 1032 wrote to memory of 960	1032	cmd.exe	39
PID 1032 wrote to memory of 960	1032	cmd.exe	39
PID 1032 wrote to memory of 960	1032	cmd.exe	39
PID 1032 wrote to memory of 960	1032	cmd.exe	39

C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\FRAUD NOTIFICATION 35738-59.doc"
1⤵
- Drops file in Windows directory
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1684
- C:\Windows\splwow64.exe
  C:\Windows\splwow64.exe 12288
  2⤵
  PID:1960

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:1660
- C:\Users\Public\7654333.exe
  "C:\Users\Public\7654333.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:852
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c taskkill /im 7654333.exe /f & erase C:\Users\Public\7654333.exe & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1032
  - - C:\Windows\SysWOW64\taskkill.exe
      taskkill /im 7654333.exe /f
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:960

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Exploitation for Client Execution

T1203

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Web Service

T1102

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/852-9-0x0000000005380000-0x0000000005391000-memory.dmp

Download

memory/852-8-0x0000000000279000-0x000000000028A000-memory.dmp

Download

memory/1396-3-0x000007FEF81B0000-0x000007FEF842A000-memory.dmp

Download